diff --git a/src/i18n/locales/es.json b/src/i18n/locales/es.json
index 3cfc891a1..b5b0a3abb 100644
--- a/src/i18n/locales/es.json
+++ b/src/i18n/locales/es.json
@@ -2885,5 +2885,9 @@
   "Source configured; file checked when loaded": "Fuente configurada; el archivo se comprobará al cargarlo",
   "Source unavailable": "Fuente no disponible",
   "Coverage tile failed": "No se pudo cargar la tesela de cobertura",
-  "Unknown": "Desconocido"
+  "Unknown": "Desconocido",
+  "USB work abandoned after a stalled transfer": "Trabajo USB cancelado tras una transferencia bloqueada",
+  "SDR decoder did not start; receiver stopped": "El decodificador SDR no arrancó; receptor detenido",
+  "SDR decoder stopped responding; receiver stopped": "El decodificador SDR dejó de responder; receptor detenido",
+  "SDR decoder fell behind; receiver stopped": "El decodificador SDR se quedó atrás; receptor detenido"
 }
diff --git a/src/i18n/locales/ru.json b/src/i18n/locales/ru.json
index 008e2fec6..019415690 100644
--- a/src/i18n/locales/ru.json
+++ b/src/i18n/locales/ru.json
@@ -2952,5 +2952,9 @@
   "Source configured; file checked when loaded": "Источник настроен; файл будет проверен при загрузке",
   "Source unavailable": "Источник недоступен",
   "Coverage tile failed": "Не удалось загрузить тайл покрытия",
-  "Unknown": "Неизвестно"
+  "Unknown": "Неизвестно",
+  "USB work abandoned after a stalled transfer": "Работа с USB прервана: передача данных зависла",
+  "SDR decoder did not start; receiver stopped": "Декодер SDR не запустился; приёмник остановлен",
+  "SDR decoder stopped responding; receiver stopped": "Декодер SDR перестал отвечать; приёмник остановлен",
+  "SDR decoder fell behind; receiver stopped": "Декодер SDR не успевает; приёмник остановлен"
 }
diff --git a/src/sdr/controller.js b/src/sdr/controller.js
index 60d766928..50fec4a38 100644
--- a/src/sdr/controller.js
+++ b/src/sdr/controller.js
@@ -17,7 +17,7 @@ import {
   selectAuthorizedSdrDevice,
 } from './usbDevices.js';
 import { summarizeLocalAdsb } from '../sources/adsbRecords.js';
-import { formatNumber, t } from '../i18n/index.js';
+import { formatNumber, msg, t, translateKnown } from '../i18n/index.js';
 
 export { createRememberingWebUsb } from './usbDevices.js';
 
@@ -298,7 +298,7 @@ function describeConnectionError(error) {
       'RTL-SDR access failed; close other SDR apps and check USB permissions',
     );
   }
-  return message || t('RTL-SDR connection failed');
+  return message ? translateKnown(message) : t('RTL-SDR connection failed');
 }
 
 function streamingMessage(mode) {
@@ -487,11 +487,11 @@ export class SdrController {
     gate.waiting += 1;
     const run = async () => {
       if (epoch !== this._usbEpoch)
-        throw new Error('USB work abandoned after a stalled transfer');
+        throw new Error(msg('USB work abandoned after a stalled transfer'));
       await Promise.allSettled(gate.reads);
       // A stalled read may have ended this session while it drained.
       if (epoch !== this._usbEpoch)
-        throw new Error('USB work abandoned after a stalled transfer');
+        throw new Error(msg('USB work abandoned after a stalled transfer'));
       return operation();
     };
     const queued = this._usbTail.then(run, run);
@@ -785,10 +785,10 @@ export class SdrController {
       decoderOverloadSnapshot: snapshot,
       message:
         reason === 'startup'
-          ? 'SDR decoder did not start; receiver stopped'
+          ? t('SDR decoder did not start; receiver stopped')
           : reason === 'stalled'
-            ? 'SDR decoder stopped responding; receiver stopped'
-            : 'SDR decoder fell behind; receiver stopped',
+            ? t('SDR decoder stopped responding; receiver stopped')
+            : t('SDR decoder fell behind; receiver stopped'),
     });
     void this.stop({ preserveMessage: true });
   }
@@ -1726,7 +1726,7 @@ export class SdrController {
         // tuneFm reports the failure; no spectrum is valid for this frame.
         if (!(await this.tuneFm(center, { quiet: true }))) {
           if (token === this._seekToken)
-            this._setState({ seeking: false, seekMessage: 'Seek stopped' });
+            this._setState({ seeking: false, seekMessage: t('Seek stopped') });
           return null;
         }
         const sequence = this._spectrumSequence;
diff --git a/src/sdr/sdrSeekLocalized.test.mjs b/src/sdr/sdrSeekLocalized.test.mjs
index 634180cdd..887d5f012 100644
--- a/src/sdr/sdrSeekLocalized.test.mjs
+++ b/src/sdr/sdrSeekLocalized.test.mjs
@@ -56,3 +56,25 @@ test('FM seek messages keep their English wording and decimal point', async () =
   assert.ok(texts.includes('Scanning 98.5 MHz…'));
   assert.match(texts.at(-1), /^Found 98\.8 MHz · \d+\.\d dB$/);
 });
+
+for (const locale of ['es', 'ru']) {
+  test(`a failed seek tune and a decoder overload are localized in ${locale}`, async () => {
+    setLocale(locale);
+    try {
+      const { c } = makeController();
+      c.tuneFm = async () => false;
+      assert.equal(await c.seekFm(1), null);
+      assert.ok(c.state.seekMessage);
+      assert.notEqual(c.state.seekMessage, 'Seek stopped');
+
+      c.stop = async () => {};
+      for (const reason of ['startup', 'stalled', 'backlog']) {
+        c._device = {};
+        c._overload(reason);
+        assert.doesNotMatch(c.state.message, /SDR decoder|receiver stopped/);
+      }
+    } finally {
+      setLocale('en');
+    }
+  });
+}