diff --git a/CHANGES.md b/CHANGES.md
index fc8c1f1..927b236 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1123,3 +1123,13 @@
 2026-07-03 09:44 [Edit] /home/steggi/pyramid/lib/widgets/settings_modal.dart
 2026-07-03 09:44 [Edit] /home/steggi/pyramid/lib/widgets/settings_modal.dart
 2026-07-03 09:45 [Write] /home/steggi/pyramid/README.md
+2026-07-03 09:46 [Edit] /home/steggi/pyramid/ROADMAP.md
+2026-07-03 09:46 [Edit] /home/steggi/pyramid/PROGRESS.md
+2026-07-03 09:49 [Write] /home/steggi/pyramid/lib/core/auth_log.dart
+2026-07-03 09:49 [Edit] /home/steggi/pyramid/lib/core/matrix_client.dart
+2026-07-03 09:50 [Edit] /home/steggi/pyramid/lib/core/matrix_client.dart
+2026-07-03 09:50 [Edit] /home/steggi/pyramid/lib/core/matrix_client.dart
+2026-07-03 09:50 [Edit] /home/steggi/pyramid/lib/widgets/settings_modal.dart
+2026-07-03 09:50 [Edit] /home/steggi/pyramid/lib/widgets/settings_modal.dart
+2026-07-03 09:50 [Edit] /home/steggi/pyramid/lib/widgets/settings_modal.dart
+2026-07-03 09:50 [Edit] /home/steggi/pyramid/lib/widgets/settings_modal.dart
diff --git a/lib/core/auth_log.dart b/lib/core/auth_log.dart
new file mode 100644
index 0000000..1c4bcb9
--- /dev/null
+++ b/lib/core/auth_log.dart
@@ -0,0 +1,51 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+import 'package:path_provider/path_provider.dart';
+
+/// Schreibt Login-/Logout-relevante Ereignisse in eine Datei, die einen
+/// App-Neustart übersteht. Zweck: den Uta-Random-Logout-Bug nachvollziehen
+/// können, auch wenn die App zwischen dem Logout und dem nächsten Blick ins
+/// Log neu gestartet wurde (siehe ROADMAP M1).
+class AuthLog {
+  static const _maxLines = 500;
+  static File? _file;
+
+  static Future<File> _ensureFile() async {
+    final existing = _file;
+    if (existing != null) return existing;
+    final dir = await getApplicationSupportDirectory();
+    final file = File(p.join(dir.path, 'auth_log.txt'));
+    return _file = file;
+  }
+
+  static Future<void> write(String message) async {
+    try {
+      final file = await _ensureFile();
+      await file.writeAsString(
+        '${DateTime.now().toIso8601String()} $message\n',
+        mode: FileMode.append,
+        flush: true,
+      );
+      final lines = await file.readAsLines();
+      if (lines.length > _maxLines) {
+        await file.writeAsString(
+          '${lines.sublist(lines.length - _maxLines).join('\n')}\n',
+        );
+      }
+    } catch (_) {
+      // Logging darf selbst nie einen Fehlerpfad (oder gar einen Logout) auslösen.
+    }
+  }
+
+  static Future<String> read() async {
+    try {
+      final file = await _ensureFile();
+      if (!await file.exists()) return '(noch keine Einträge)';
+      return await file.readAsString();
+    } catch (e) {
+      return 'Log konnte nicht gelesen werden: $e';
+    }
+  }
+}
diff --git a/lib/core/matrix_client.dart b/lib/core/matrix_client.dart
index 3622917..4f0f8bc 100644
--- a/lib/core/matrix_client.dart
+++ b/lib/core/matrix_client.dart
@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:io';
 
 import 'package:flutter/foundation.dart';
@@ -10,6 +11,7 @@ import 'package:path/path.dart' as p;
 import 'package:path_provider/path_provider.dart';
 import 'package:sqflite/sqflite.dart' as sqflite_native;
 import 'package:sqflite_common_ffi/sqflite_ffi.dart';
+import 'package:pyramid/core/auth_log.dart';
 import 'package:pyramid/core/voip_manager.dart';
 
 final matrixClientProvider = FutureProvider<Client>((ref) async {
@@ -63,11 +65,23 @@ final matrixClientProvider = FutureProvider<Client>((ref) async {
     ),
   );
 
+  // Persistiert Warnungen/Fehler des SDK sowie jeden Login-Status-Wechsel,
+  // damit ein unerwarteter Logout (z. B. Soft-Logout vom Server) auch nach
+  // einem App-Neustart noch nachvollziehbar ist (ROADMAP M1, Uta-Logout-Bug).
+  Logs().onLog = (event) {
+    if (event.level.index <= Level.warning.index) {
+      unawaited(AuthLog.write('[SDK ${event.level.name}] ${event.toFormattedString()}'));
+    }
+  };
+  client.onLoginStateChanged.stream.listen((state) {
+    unawaited(AuthLog.write('LoginState -> ${state.name}'));
+  });
+
   await client.init(
     waitForFirstSync: false,
     waitUntilLoadCompletedLoaded: false,
   );
-  
+
   // Re-use or create singleton instance
   try {
     PyramidVoipManager.instance.client; 
diff --git a/lib/widgets/settings_modal.dart b/lib/widgets/settings_modal.dart
index fff79bd..bf0e8e4 100644
--- a/lib/widgets/settings_modal.dart
+++ b/lib/widgets/settings_modal.dart
@@ -21,6 +21,7 @@ import 'package:pretty_qr_code/pretty_qr_code.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:pointycastle/export.dart' as pc;
 import 'package:pyramid/core/app_state.dart';
+import 'package:pyramid/core/auth_log.dart';
 import 'package:pyramid/core/e2ee_diagnostics.dart';
 import 'package:pyramid/core/livekit_call_manager.dart';
 import 'package:pyramid/core/matrix_client.dart';
@@ -596,6 +597,7 @@ class _LogoutNavButtonState extends ConsumerState<_LogoutNavButton> {
     try {
       widget.onClose();
       final client = await ref.read(matrixClientProvider.future);
+      unawaited(AuthLog.write('User-initiated logout (Settings-Sidebar)'));
       await client.logout();
     } catch (_) {}
   }
@@ -4839,6 +4841,7 @@ class _DeleteAccountDialogState extends ConsumerState<_DeleteAccountDialog> {
       return;
     }
     // Konto wurde gelöscht — ausloggen
+    unawaited(AuthLog.write('User-initiated logout (Konto gelöscht)'));
     try { await client.logout(); } catch (_) {}
   }
 
@@ -5137,6 +5140,7 @@ class _AboutSection extends ConsumerWidget {
     );
     if (confirm == true) {
       final client = await ref.read(matrixClientProvider.future);
+      unawaited(AuthLog.write('User-initiated logout (Settings)'));
       await client.logout().catchError((_) {});
     }
   }