UE4 UBT is ok, but UAT always fail

recent builds are frequent, but not mandatory
I don’t know where the problem is.

15:03:34 [00:00:17.990]   LogInit: Display: NOTE: Only first 50 warnings displayed.
15:03:34 [00:00:17.990]   LogInit: Display:
15:03:34 [00:00:17.990]   LogInit: Display: Success - 0 error(s), 1090 warning(s)
15:03:34 [00:00:17.990]   LogInit: Display:
15:03:34 [00:00:17.990]   
15:03:34 [00:00:17.990]   Execution of commandlet took:  1.38 seconds
15:03:35 [00:00:18.272]   LogShaderCompilers: Display: === FShaderJobCache stats ===
15:03:35 [00:00:18.272]   LogShaderCompilers: Display: Total job queries 0, among them cache hits 0 (0.00%)
15:03:35 [00:00:18.272]   LogShaderCompilers: Display: Tracking 0 distinct input hashes that result in 0 distinct outputs (0.00%)
15:03:35 [00:00:18.273]   LogShaderCompilers: Display: RAM used: 0.00 MB (0.00 GB) of 1638.40 MB (1.60 GB) budget. Usage: 0.00%
15:03:35 [00:00:18.273]   LogShaderCompilers: Display: ================================================
15:03:35 [00:00:18.285]   LogShaderCompilers: Display: Shaders left to compile 0
15:03:37 [00:00:20.287]   LogWindows: Error: begin: stack for UAT
15:03:37 [00:00:20.287]   LogWindows: Error: === Critical error: ===
15:03:37 [00:00:20.287]   LogWindows: Error:
15:03:37 [00:00:20.287]   LogWindows: Error: Fatal error!
15:03:37 [00:00:20.287]   LogWindows: Error:
15:03:37 [00:00:20.287]   LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION 0x0000020310c1a4c0
15:03:37 [00:00:20.287]   LogWindows: Error:
15:03:37 [00:00:20.287]   LogWindows: Error: [Callstack] 0x0000020310c1a4c0 UnknownFunction []
15:03:37 [00:00:20.287]   LogWindows: Error: [Callstack] 0x00007ffca0f18b7b UE4Editor-ContentBrowser.dll!TArray<TDelegate<TSharedRef<FExtender,0> __cdecl(TArray<FAssetData,TSizedDefaultAllocator<32> > const &),FDefaultDelegateUserPolicy>,TSizedDefaultAllocator<32> >::~TArray<TDelegate<TSharedRef<FExtender,0> __cdecl(TArray<FAssetData,TSizedDefaultAllocator<32> > const &),FDefaultDelegateUserPolicy>,TSizedDefaultAllocator<32> >() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h:621]
15:03:37 [00:00:20.287]   LogWindows: Error: [Callstack] 0x00007ffca0f26b8a UE4Editor-ContentBrowser.dll!FContentBrowserModule::~FContentBrowserModule() []
15:03:37 [00:00:20.288]   LogWindows: Error: [Callstack] 0x00007ffca0f399b4 UE4Editor-ContentBrowser.dll!FContentBrowserModule::`scalar deleting destructor'() []
15:03:37 [00:00:20.288]   LogWindows: Error: [Callstack] 0x00007ffcc6379e8c UE4Editor-Core.dll!FModuleManager::UnloadModulesAtShutdown() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Modules\ModuleManager.cpp:731]
15:03:37 [00:00:20.288]   LogWindows: Error: [Callstack] 0x00007ff7128a0506 UE4Editor-Cmd.exe!FEngineLoop::Exit() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4297]
15:03:37 [00:00:20.288]   LogWindows: Error: [Callstack] 0x00007ff7128a1063 UE4Editor-Cmd.exe!GuardedMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:192]
15:03:37 [00:00:20.288]   LogWindows: Error: [Callstack] 0x00007ff7128a10ba UE4Editor-Cmd.exe!GuardedMainWrapper() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
15:03:37 [00:00:20.288]   LogWindows: Error: [Callstack] 0x00007ff7128a40dd UE4Editor-Cmd.exe!LaunchWindowsStartup() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:273]
15:03:37 [00:00:20.288]   LogWindows: Error: [Callstack] 0x00007ff7128b5984 UE4Editor-Cmd.exe!WinMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:320]
15:03:37 [00:00:20.288]   LogWindows: Error: [Callstack] 0x00007ff7128b78be UE4Editor-Cmd.exe!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
15:03:37 [00:00:20.289]   LogWindows: Error: [Callstack] 0x00007ffd01317034 KERNEL32.DLL!UnknownFunction []
15:03:37 [00:00:20.289]   LogWindows: Error: [Callstack] 0x00007ffd03142651 ntdll.dll!UnknownFunction []
15:03:37 [00:00:20.289]   LogWindows: Error:
15:03:37 [00:00:20.289]   LogWindows: Error: end: stack for UAT
15:03:42 [00:00:25.041] Took 20.534412s to run UE4Editor-Cmd.exe, ExitCode=3
15:03:42 [00:00:25.050] ERROR: Cook failed.
15:03:42 [00:00:25.050]        (see C:\Users\Administrator.DESKTOP-MNJHIVN\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+UE_4.27\Log.txt for full exception trace)
15:03:42 [00:00:25.060] AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
15:03:42 BUILD FAILED