Have had no issue with my main screen at all, it's 10 months old. Updated my Z Flip 6 to One UI 7 the day it was released. It immediately developed an issue where it would take the main screen 10 to 30 seconds to come on when opened. This went on for a couple of days. Yesterday it started showing green/pink graphical artefacts when it did come on and was often unresponsive to touch. Last night the main screen stopped coming on at all. 

I though maybe hardware but during a factory reset the main screen comes on fine with the Android logo etc. As soon as One UI 7 loads it stops working again.

As such I can't remove myself from the beta using the Members app. Can I still roll back to One UI 6 using a PC?