Zwift crashing in long races


I already tried zwift support but they havent replied from last weeks crash. It has now crashed two weeks in a row. Both times doing the DBR sufferday ride on Saturday mornings at 9:30am.

Both races I got to around 2hours in and zwift crashed. No error or message just everything disappears.

In windows event viewer I can see this at time of the crash
Application error:
Faulting application name: ZwiftApp.exe, version:, time stamp: 0x5eab4e52
Faulting module name: ntdll.dll, version: 10.0.18362.815, time stamp: 0xb29ecf52
Exception code: 0xc0000374
Fault offset: 0x00000000000f9229
Faulting process ID: 0x43bc
Faulting application start time: 0x01d62b5661b64436
Faulting application path: C:\Program Files (x86)\Zwift\ZwiftApp.exe
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report ID: 4a70c376-198b-4ac8-ae23-762ef0dcc1af
Faulting package full name:
Faulting package-relative application ID:

System spec

Any help would be appreciated