diff --git a/config/config_netlify_preview.json b/config/config_netlify_preview.json
index 143cccaf..c8972c38 100644
--- a/config/config_netlify_preview.json
+++ b/config/config_netlify_preview.json
@@ -6,12 +6,12 @@
     }
   },
   "ssla": "https://static.element.io/legal/element-software-and-services-license-agreement-uk-1.pdf",
-  "sync_disconnect_grace_period_ms": 20000,
+  "sync_disconnect_grace_period_ms": 60000,
   "matrix_rtc_session": {
     "wait_for_key_rotation_ms": 3000,
     "membership_event_expiry_ms": 180000000,
-    "delayed_leave_event_delay_ms": 60000,
-    "delayed_leave_event_restart_ms": 4000,
+    "delayed_leave_event_delay_ms": 120000,
+    "delayed_leave_event_restart_ms": 15000,
     "network_error_retry_ms": 100
   },
   "posthog": {
diff --git a/src/state/CallViewModel/CallViewModel.ts b/src/state/CallViewModel/CallViewModel.ts
index e298bcfd..9d5c6534 100644
--- a/src/state/CallViewModel/CallViewModel.ts
+++ b/src/state/CallViewModel/CallViewModel.ts
@@ -409,8 +409,9 @@ export function createCallViewModel$(
     options.encryptionSystem,
     matrixRTCSession,
   );
-  const matrixRTCMode$ =
-    options.matrixRTCMode$ ?? constant(MatrixRTCMode.Legacy);
+  // const matrixRTCMode$ =
+  //   options.matrixRTCMode$ ?? constant(MatrixRTCMode.Legacy);
+  const matrixRTCMode$ = constant(MatrixRTCMode.Compatibility);
 
   // Each hbar seperates a block of input variables required for the CallViewModel to function.
   // The outputs of this block is written under the hbar.