diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 67f1fdc48..a537ee678 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -17,7 +17,7 @@ concurrency:
 
 env:
   TEST_TARGETS: "LiveKitCoreTests LiveKitObjCTests"
-  TEST_TIMEOUT_MINUTES: 10
+  TEST_TIMEOUT_MINUTES: 15
   TEST_RETRY_ATTEMPTS: 3
 
 jobs:
@@ -90,7 +90,7 @@ jobs:
             platform: "tvOS Simulator,name=Apple TV,OS=26.0"
 
     runs-on: ${{ matrix.os }}
-    timeout-minutes: 35
+    timeout-minutes: 60
     defaults:
       run:
         shell: bash
@@ -141,7 +141,7 @@ jobs:
                 -enableThreadSanitizer ${{ matrix.tsan == true && 'YES' || 'NO' }} \
                 APPLICATION_EXTENSION_API_ONLY=${{ matrix.extension-api-only == true && 'YES' || 'NO' }} \
                 -only-testing:$test \
-                -parallel-testing-enabled YES \
+                -parallel-testing-enabled NO \
                 | xcbeautify --renderer github-actions
               then
                 echo "::error::Test failed: $test"
diff --git a/Sources/LiveKit/Support/AudioMixRecorder.swift b/Sources/LiveKit/Support/AudioMixRecorder.swift
index 46f8c6771..70e94f7e0 100644
--- a/Sources/LiveKit/Support/AudioMixRecorder.swift
+++ b/Sources/LiveKit/Support/AudioMixRecorder.swift
@@ -161,7 +161,10 @@ public class AudioMixRecorder: Loggable, @unchecked Sendable {
             source.stop()
         }
         audioEngine.stop()
-        audioFile = nil
+
+        writeQueue.sync {
+            audioFile = nil
+        }
     }
 
     // MARK: - Source
diff --git a/Tests/LiveKitTestSupport/Assertions.swift b/Tests/LiveKitTestSupport/Assertions.swift
index edcd68608..7546a949e 100644
--- a/Tests/LiveKitTestSupport/Assertions.swift
+++ b/Tests/LiveKitTestSupport/Assertions.swift
@@ -28,6 +28,7 @@ public func XCTAssertThrowsErrorAsync(_ expression: @autoclosure () async throws
 public extension LKTestCase {
     func noLeaks(of instance: AnyObject & Sendable, file: StaticString = #filePath, line: UInt = #line) {
         addTeardownBlock { [weak instance] in
+            try await Task.sleep(nanoseconds: NSEC_PER_SEC)
             XCTAssertNil(instance, "Leaked object: \(String(describing: instance))", file: file, line: line)
         }
     }