Apple Watch - Blank Screen

Has anybody ever had an issue with your Apple Watch where the screen just goes entirely blank? Mine has been doing it for some time now. I have the series 6.

The weird part is that it’s actually still functioning. I have a passcode set on it and because it’s not on my wrist, I have to enter the passcode to access my watch. I can hear the digits as I’m pressing them… and the it vibrates when the incorrect passcode is entered. Also, it rings when my phone rings - so it’s still functioning.

I took it in to Apple and they said they had no idea and because my warranty had expired they said they don’t repair watches as they’re not made to be opened and usually just replace them.

the funny thing is - it randomly came back to life when I was talking/showing an Apple representative in the store.

She had no idea what the issue may be or what’s causing it.

ANY HELP WOULD BE GREATLY APPRECIATED