Preview window goes full screen on my main monitor.

Hello everyone, I'm stuck with a very sever problem with Premiere right now, I tried contacting Adobe Support but I can't get through to anyone. Please see vimeo link below for my deminstrtation of the problem. 

https://vimeo.com/464617259/922f979a85

My preview monitor sparaticly goes full screen on my main monitor and most of the time the only way to exit is to force quit Premiere. Is there a solutiuon to this problem?

I'm on a Windows 10 Build, latest version

AMD Ryzen 2700X

MSI Motherboard

64GB RAM

EVGA GTX 1650 Super 

All drivers are up to date and I've tried rolling back the GPU drivers 2 and 3 versions back with no luck. I've uninstalled Premiere and Creative Cloud, reinstalled, no luck. This problem even happens if I completly disable my second monitor. 

Premiere is bassically unusable right now because of this. Adobe Support is unreachable, please can anyone shed some light on this issue. Thanks!