Apple Watch series 6 random black screen

My Apple Watch works fine apart from randomly everyday the screen goes totally black and won’t respond.

The watch is on because I get haptic feedback but no display. To wake it back up I have to either reset or take it off for a minute then it works fine again.

I’ve tried resetting, repairing and a full restore. Also tried turning wrist detection off and on again but nothing helps.

I’m running watch os 7.4.1 and iOS 14.5.1 so all up to date.

Can anyone help?