diff --git a/js/app.js b/js/app.js
index 804dc5a0..eeeaa2f3 100644
--- a/js/app.js
+++ b/js/app.js
@@ -275,6 +275,7 @@ class Application {
     this.dmRelayHints = new Map();
     this.authLoadingState = { profile: "idle", lists: "idle", dms: "idle" };
     this.relayUiRefreshTimeout = null;
+    this.lastRelayHealthWarningAt = 0;
     this.activeIntervals = [];
     this.torrentStatusIntervalId = null;
     this.torrentStatusNodes = null;
@@ -6567,6 +6568,35 @@ class Application {
       });
   }
 
+  checkRelayHealthWarning() {
+    if (!nostrClient || typeof nostrClient.getHealthyRelays !== "function") {
+      return false;
+    }
+
+    const relayCandidates = Array.isArray(nostrClient.relays) ? nostrClient.relays : [];
+    if (!relayCandidates.length) {
+      return false;
+    }
+
+    const healthyRelays = nostrClient.getHealthyRelays(relayCandidates);
+    if (healthyRelays.length) {
+      return false;
+    }
+
+    const now = Date.now();
+    const cooldownMs = 30000;
+    if (now - (this.lastRelayHealthWarningAt || 0) < cooldownMs) {
+      return true;
+    }
+
+    this.lastRelayHealthWarningAt = now;
+    this.showStatus(
+      "All configured relays are unhealthy. Data may be missing until a relay reconnects.",
+      { autoHideMs: 12000, showSpinner: false },
+    );
+    return true;
+  }
+
   /**
    * Subscribe to videos (older + new) and render them as they come in.
    */
@@ -6586,6 +6616,7 @@ class Application {
     this.loadVideosPromise = (async () => {
       devLogger.log("Starting loadVideos... (forceFetch =", forceFetch, ")");
       this.setFeedTelemetryContext("recent");
+      this.checkRelayHealthWarning();
 
       const container = this.mountVideoListView();
       const hasCachedVideos =
@@ -6641,6 +6672,7 @@ class Application {
   async loadForYouVideos(forceFetch = false) {
     devLogger.log("Starting loadForYouVideos... (forceFetch =", forceFetch, ")");
     this.setFeedTelemetryContext("for-you");
+    this.checkRelayHealthWarning();
 
     const container = this.mountVideoListView({ includeTags: false });
     const hasCachedVideos =
diff --git a/js/embed.js b/js/embed.js
index 9cdcbec3..ed785957 100644
--- a/js/embed.js
+++ b/js/embed.js
@@ -1,6 +1,7 @@
 import Application from "./app.js";
 import { nostrClient } from "./nostrClientFacade.js";
 import { convertEventToVideo, getDTagValueFromTags } from "./nostr/index.js";
+import { sanitizeRelayList } from "./nostr/nip46Client.js";
 import { resolveVideoPointer } from "./utils/videoPointer.js";
 import { devLogger, userLogger } from "./utils/logger.js";
 import { nostrToolsReady } from "./nostrToolsBootstrap.js";
@@ -180,13 +181,7 @@ const buildRelayList = (relays) => {
     ...(Array.isArray(nostrClient.relays) ? nostrClient.relays : []),
   ];
 
-  const result = Array.from(
-    new Set(
-      combined
-        .map((relay) => (typeof relay === "string" ? relay.trim() : ""))
-        .filter(Boolean)
-    )
-  );
+  const result = sanitizeRelayList(combined);
   diag?.emit("relay-list", { relays: result });
   return result;
 };
diff --git a/js/nostr/client.js b/js/nostr/client.js
index 2c964634..245b275c 100644
--- a/js/nostr/client.js
+++ b/js/nostr/client.js
@@ -415,6 +415,8 @@ const RELAY_RECONNECT_MAX_DELAY_MS = 60000;
 const RELAY_RECONNECT_MAX_ATTEMPTS = 5;
 const RELAY_CIRCUIT_BREAKER_THRESHOLD = 3;
 const RELAY_CIRCUIT_BREAKER_COOLDOWN_MS = 10 * 60 * 1000;
+const RELAY_FAILURE_WINDOW_MS = 5 * 60 * 1000;
+const RELAY_FAILURE_WINDOW_THRESHOLD = 3;
 const EVENTS_CACHE_STORAGE_KEY = "bitvid:eventsCache:v1";
 // We use the policy TTL, but currently the storage backend is hardcoded to IDB (with localStorage fallback).
 // Future refactors should make EventsCacheStore dynamic based on CACHE_POLICIES[NOTE_TYPES.VIDEO_POST].storage.
@@ -1294,6 +1296,7 @@ export class NostrClient {
     this.unreachableRelays = new Set();
     this.relayBackoff = new Map();
     this.relayFailureCounts = new Map();
+    this.relayFailureWindows = new Map();
     this.relayCircuitBreakers = new Map();
     this.relayReconnectTimer = null;
     this.relayReconnectAttempt = 0;
@@ -4578,10 +4581,30 @@ export class NostrClient {
     }
     this.relayBackoff.delete(normalized);
     this.relayFailureCounts.delete(normalized);
+    this.relayFailureWindows.delete(normalized);
     this.unreachableRelays.delete(normalized);
     this.relayCircuitBreakers.delete(normalized);
   }
 
+  recordRelayFailureWindow(url) {
+    if (!url || typeof url !== "string") {
+      return 0;
+    }
+    const normalized = url.trim();
+    if (!normalized) {
+      return 0;
+    }
+    const now = Date.now();
+    const cutoff = now - RELAY_FAILURE_WINDOW_MS;
+    const history = this.relayFailureWindows.get(normalized) || [];
+    const filtered = history.filter(
+      (timestamp) => Number.isFinite(timestamp) && timestamp >= cutoff,
+    );
+    filtered.push(now);
+    this.relayFailureWindows.set(normalized, filtered);
+    return filtered.length;
+  }
+
   markRelayUnreachable(url, ttlMs = 60000, { reason = null } = {}) {
     if (!url || typeof url !== "string") {
       return;
@@ -4590,6 +4613,7 @@ export class NostrClient {
     if (!normalized) {
       return;
     }
+    const windowFailureCount = this.recordRelayFailureWindow(normalized);
     const nextFailureCount = (this.relayFailureCounts.get(normalized) || 0) + 1;
     this.relayFailureCounts.set(normalized, nextFailureCount);
     const backoffMs = this.resolveRelayBackoffMs(nextFailureCount, ttlMs);
@@ -4601,7 +4625,7 @@ export class NostrClient {
       reason,
     });
     this.unreachableRelays.add(normalized);
-    if (nextFailureCount >= RELAY_CIRCUIT_BREAKER_THRESHOLD) {
+    if (windowFailureCount >= RELAY_FAILURE_WINDOW_THRESHOLD) {
       const now = Date.now();
       const openUntil = now + RELAY_CIRCUIT_BREAKER_COOLDOWN_MS;
       const existing = this.relayCircuitBreakers.get(normalized);
@@ -4609,17 +4633,18 @@ export class NostrClient {
         existing && Number.isFinite(existing.openUntil)
           ? Math.max(existing.openUntil, openUntil)
           : openUntil;
+      const circuitReason = reason || "windowed-failures";
       this.relayCircuitBreakers.set(normalized, {
         openUntil: nextOpenUntil,
         failureCount: nextFailureCount,
-        reason,
+        reason: circuitReason,
       });
       if (isDevMode) {
         devLogger.debug("[nostr] Circuit breaker opened for relay.", {
           relay: normalized,
           openUntil: nextOpenUntil,
           failureCount: nextFailureCount,
-          reason,
+          reason: circuitReason,
         });
       }
     }
@@ -4644,6 +4669,7 @@ export class NostrClient {
         }
         this.relayCircuitBreakers.delete(url);
         this.relayFailureCounts.delete(url);
+        this.relayFailureWindows.delete(url);
         this.unreachableRelays.delete(url);
         this.relayBackoff.delete(url);
         if (isDevMode) {
@@ -4662,6 +4688,7 @@ export class NostrClient {
       }
       this.relayBackoff.delete(url);
       this.relayFailureCounts.delete(url);
+      this.relayFailureWindows.delete(url);
       this.unreachableRelays.delete(url);
       if (isDevMode) {
         devLogger.debug(`[nostr] Relay backoff expired for ${url}.`);
diff --git a/js/services/hashtagPreferencesService.js b/js/services/hashtagPreferencesService.js
index 538ceaf1..ec6c1de1 100644
--- a/js/services/hashtagPreferencesService.js
+++ b/js/services/hashtagPreferencesService.js
@@ -15,6 +15,7 @@ import {
   assertAnyRelayAccepted,
 } from "../nostrPublish.js";
 import { userLogger, devLogger } from "../utils/logger.js";
+import { sanitizeRelayList } from "../nostr/nip46Client.js";
 import { normalizeHashtag } from "../utils/hashtagNormalization.js";
 import { profileCache } from "../state/profileCache.js";
 import { DEFAULT_RELAY_URLS } from "../nostr/toolkit.js";
@@ -98,14 +99,6 @@ function normalizeHexPubkey(pubkey) {
   return null;
 }
 
-function sanitizeRelayList(candidate) {
-  return Array.isArray(candidate)
-    ? candidate
-        .map((url) => (typeof url === "string" ? url.trim() : ""))
-        .filter(Boolean)
-    : [];
-}
-
 function normalizeEncryptionToken(value) {
   if (typeof value !== "string") {
     return "";
diff --git a/js/services/relayHealthService.js b/js/services/relayHealthService.js
index 87ed52fc..2bc64750 100644
--- a/js/services/relayHealthService.js
+++ b/js/services/relayHealthService.js
@@ -132,6 +132,10 @@ class RelayHealthService {
     if (Number.isFinite(latencyMs)) {
       state.lastLatencyMs = Math.max(0, Math.round(latencyMs));
     }
+
+    if (this.nostrClient && typeof this.nostrClient.clearRelayBackoff === "function") {
+      this.nostrClient.clearRelayBackoff(relayUrl);
+    }
   }
 
   recordRelayFailure(relayUrl, error) {
@@ -141,6 +145,12 @@ class RelayHealthService {
     state.lastCheckedAt = Date.now();
     state.lastErrorAt = Date.now();
 
+    if (this.nostrClient && typeof this.nostrClient.markRelayUnreachable === "function") {
+      this.nostrClient.markRelayUnreachable(relayUrl, 60000, {
+        reason: "relay-health-failed",
+      });
+    }
+
     this.logger.dev.warn("[relayHealth] Relay check failed.", {
       relayUrl,
       error,
diff --git a/js/subscriptions.js b/js/subscriptions.js
index 760cd616..6a61cc8d 100644
--- a/js/subscriptions.js
+++ b/js/subscriptions.js
@@ -5,7 +5,7 @@ import {
   requestDefaultExtensionPermissions,
 } from "./nostrClientFacade.js";
 import { convertEventToVideo as sharedConvertEventToVideo } from "./nostr/index.js";
-import { normalizeNostrPubkey } from "./nostr/nip46Client.js";
+import { normalizeNostrPubkey, sanitizeRelayList } from "./nostr/nip46Client.js";
 import {
   listVideoViewEvents,
   subscribeVideoViewEvents,
@@ -1229,13 +1229,6 @@ class SubscriptionsManager {
       throw signErr;
     }
 
-    const sanitizeRelayList = (candidate) =>
-      Array.isArray(candidate)
-        ? candidate
-            .map((url) => (typeof url === "string" ? url.trim() : ""))
-            .filter(Boolean)
-        : [];
-
     const writeRelays = sanitizeRelayList(nostrClient.writeRelays);
     const fallbackRelays = writeRelays.length
       ? writeRelays