Same for us. In our case, the game crashes shortly after.
...
[2017.11.29-10.31.53:493][375]LogAudio: Warning: Waited 3098.317871ms for audio thread.
[2017.11.29-10.31.53:528][375]LogAudio: Warning: Waited 3133.539307ms for audio thread.
[2017.11.29-10.31.53:563][375]LogAudio: Warning: Waited 3168.733887ms for audio thread.
[2017.11.29-10.31.53:598][375]LogAudio: Warning: Waited 3203.856445ms for audio thread.
[2017.11.29-10.31.53:612][375]LogThreadingWindows: Error: Runnable thread AudioThread crashed.
[2017.11.29-10.31.53:612][375]LogWindows: Error: === Critical error: ===
[2017.11.29-10.31.53:612][375]LogWindows: Error:
[2017.11.29-10.31.53:612][375]LogWindows: Error: Assertion failed: IsValidIndex(Index) [File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\Core\Public\UObject/NameTypes.h] [Line: 356]
[2017.11.29-10.31.53:612][375]LogWindows: Error: IsValidIndex(3080308)
[2017.11.29-10.31.53:612][375]LogWindows: Error:
[2017.11.29-10.31.53:612][375]LogWindows: Error:
[2017.11.29-10.31.53:612][375]LogWindows: Error: KERNELBASE.dll!0x0000000061EC7788
[2017.11.29-10.31.53:612][375]LogWindows: Error: Hoat.exe!0x00000000878E1740
...
[2017.11.29-10.31.53:612][375]LogWindows: Error: Hoat.exe!0x00000000878D709C
[2017.11.29-10.31.53:612][375]LogWindows: Error: KERNEL32.DLL!0x0000000064C08364
[2017.11.29-10.31.53:612][375]LogWindows: Error: ntdll.dll!0x00000000653570D1
[2017.11.29-10.31.53:612][375]LogWindows: Error: ntdll.dll!0x00000000653570D1
[2017.11.29-10.31.53:612][375]LogWindows: Error:
[2017.11.29-10.31.53:612][375]LogWindows: Error: Crash in runnable thread AudioThread