I suspect this is EAC-related. Please ensure you have appropriate Anti-Virus and Firewall exceptions in place for both Vermintide 2 and Easy Anti-Cheat. You’ll need to add the following exceptions:
vermintide2.exe in \Program Files (x86)\Steam\steamapps\common\Warhammer Vermintide 2\binaries
vermintide2_dx12.exe in \Program Files (x86)\Steam\steamapps\common\Warhammer Vermintide 2\binaries_dx12
EasyAntiCheat.exe in \Program Files (x86)\EasyAntiCheat
Failing this, please try a Selective Startup which disables background applications in case this is the cause:
Sorry to hear that. This issue isn’t widely reported is likely caused by something local on your system. Either settings, drivers, a conflicting program etc. it isn’t something the development team can specifically fix
Unfortunately, this will require some trial and error and these suggestions are shots in the dark, but hopefully something will stick. Please let me know how it goes.