diff --git a/lib/upload-manager.js b/lib/upload-manager.js
index f08210f..8562aaf 100644
--- a/lib/upload-manager.js
+++ b/lib/upload-manager.js
@@ -67,6 +67,10 @@ class UploadManager extends EventEmitter {
     return this._accountOverrides.get(hoster) || null;
   }
 
+  getActiveJobCount() {
+    return this.activeJobs.size;
+  }
+
   clearFailedAccount(hoster, accountId) {
     return this._failedAccounts.delete(`${hoster}:${accountId}`);
   }
diff --git a/main.js b/main.js
index 3c6fb5d..de00f21 100644
--- a/main.js
+++ b/main.js
@@ -227,11 +227,51 @@ function rotLog(msg, ts) {
   } catch {}
 }
 
-// Catch unhandled rejections from fire-and-forget async calls
+function _writeCrashLog(prefix, err, extra) {
+  try {
+    const ts = new Date().toISOString();
+    const line = `[${ts}] ${prefix} ${err && err.stack ? err.stack : (err && err.message) || String(err)}${extra ? ' :: ' + JSON.stringify(extra) : ''}\n`;
+    try {
+      const target = getDebugLogPath();
+      fs.appendFileSync(target, line, 'utf-8');
+    } catch {}
+    try {
+      const crashDir = path.dirname(getDebugLogPath());
+      fs.appendFileSync(path.join(crashDir, 'crash.log'), line, 'utf-8');
+    } catch {}
+  } catch {}
+}
+
 process.on('unhandledRejection', (reason) => {
   debugLog(`UNHANDLED REJECTION: ${reason && reason.stack ? reason.stack : reason}`);
+  _writeCrashLog('UNHANDLED REJECTION', reason);
 });
 
+process.on('uncaughtException', (err, origin) => {
+  _writeCrashLog('UNCAUGHT EXCEPTION (' + origin + ')', err);
+  debugLog(`UNCAUGHT EXCEPTION (${origin}): ${err && err.stack ? err.stack : err}`);
+});
+
+process.on('exit', (code) => {
+  try { _writeCrashLog('PROCESS EXIT', new Error('code=' + code)); } catch {}
+});
+
+process.on('warning', (warning) => {
+  debugLog(`PROCESS WARNING: ${warning.name} ${warning.message}`);
+});
+
+for (const sig of ['SIGINT', 'SIGTERM', 'SIGHUP', 'SIGBREAK']) {
+  try {
+    process.on(sig, () => {
+      _writeCrashLog('SIGNAL ' + sig, new Error('process received ' + sig));
+      try {
+        if (_debugLogBuffer.length) fs.appendFileSync(getDebugLogPath(), _debugLogBuffer.join(''), 'utf-8');
+      } catch {}
+      process.exit(0);
+    });
+  } catch {}
+}
+
 function withTimeout(promise, timeoutMs, label) {
   return new Promise((resolve, reject) => {
     const timer = setTimeout(() => {
@@ -947,6 +987,51 @@ function createWindow() {
   });
 
   mainWindow.webContents.setBackgroundThrottling(false);
+
+  mainWindow.webContents.on('render-process-gone', (_event, details) => {
+    _writeCrashLog('RENDER PROCESS GONE', new Error(details.reason || 'unknown'), details);
+    debugLog(`RENDER PROCESS GONE: reason=${details.reason} exitCode=${details.exitCode}`);
+    if (mainWindow && !mainWindow.isDestroyed()) {
+      try {
+        const choice = dialog.showMessageBoxSync(mainWindow, {
+          type: 'error',
+          title: 'Renderer abgestürzt',
+          message: `Der Renderer-Prozess ist abgestürzt (${details.reason}).`,
+          detail: 'Bitte Diagnose-Paket exportieren und einsenden. Klick "Neu laden" um die UI wiederherzustellen — laufende Uploads im Main-Process bleiben aktiv.',
+          buttons: ['Neu laden', 'Beenden'],
+          defaultId: 0,
+          cancelId: 1
+        });
+        if (choice === 0) {
+          mainWindow.webContents.reload();
+        } else {
+          app.exit(1);
+        }
+      } catch {
+        try { mainWindow.webContents.reload(); } catch {}
+      }
+    }
+  });
+
+  mainWindow.webContents.on('unresponsive', () => {
+    _writeCrashLog('RENDERER UNRESPONSIVE', new Error('webContents unresponsive'));
+    debugLog('RENDERER UNRESPONSIVE');
+  });
+
+  mainWindow.webContents.on('responsive', () => {
+    debugLog('RENDERER RESPONSIVE AGAIN');
+  });
+
+  mainWindow.webContents.on('did-fail-load', (_event, errorCode, errorDescription, validatedURL) => {
+    _writeCrashLog('DID-FAIL-LOAD', new Error(errorDescription), { errorCode, validatedURL });
+    debugLog(`DID-FAIL-LOAD: ${errorCode} ${errorDescription} url=${validatedURL}`);
+  });
+
+  app.on('child-process-gone', (_event, details) => {
+    _writeCrashLog('CHILD PROCESS GONE', new Error(details.reason || 'unknown'), details);
+    debugLog(`CHILD PROCESS GONE: type=${details.type} reason=${details.reason} exitCode=${details.exitCode}`);
+  });
+
   mainWindow.loadFile(path.join(__dirname, 'renderer', 'index.html'));
 }
 
@@ -1049,6 +1134,9 @@ app.whenReady().then(() => {
 });
 
 app.on('window-all-closed', () => {
+  const activeJobs = uploadManager && typeof uploadManager.getActiveJobCount === 'function' ? uploadManager.getActiveJobCount() : 0;
+  debugLog(`window-all-closed: activeJobs=${activeJobs}, uploadManager=${!!uploadManager}`);
+  _writeCrashLog('WINDOW-ALL-CLOSED', new Error('all windows closed'), { activeJobs, uploadManager: !!uploadManager });
   app.quit();
 });
 
diff --git a/renderer/app.js b/renderer/app.js
index 4ba315a..52e0d20 100644
--- a/renderer/app.js
+++ b/renderer/app.js
@@ -77,6 +77,19 @@ let _sessionErrorCount = 0;
 // Huge with thousands of rows × thousands of incoming results.
 const _sessionFileKeys = new Set();
 
+window.addEventListener('error', (e) => {
+  try {
+    const msg = `RENDERER ERROR: ${e.message} at ${e.filename}:${e.lineno}:${e.colno}${e.error && e.error.stack ? '\n' + e.error.stack : ''}`;
+    if (window.api && window.api.debugLog) window.api.debugLog(msg);
+  } catch {}
+});
+window.addEventListener('unhandledrejection', (e) => {
+  try {
+    const reason = e.reason && e.reason.stack ? e.reason.stack : (e.reason && e.reason.message) || String(e.reason);
+    if (window.api && window.api.debugLog) window.api.debugLog(`RENDERER UNHANDLED REJECTION: ${reason}`);
+  } catch {}
+});
+
 // --- Init ---
 async function init() {
   config = await window.api.getConfig();