AVG turning monitors off after inactivity?

AVG Performance
1

Hello Ivy,
We're glad to help you.
Presently, we do not have any features to turn off the monitor during inactivity. 
If you suspect that AVG causing this issue, please temporarily turn off all the AVG shields as mentioned in the below article and check if that resolve the problem. If yes, please narrow down the shield which might cause this issue and revert to this post.
Temporarily disabling AVG AntiVirus protection
Meanwhile, I'd recommend you to contact the Microsoft support and report this issue.
Thank you.

2

Hello Ivy,
We're glad to help you.
Presently, we do not have any features to turn off the monitor during inactivity. 
If you suspect that AVG causing this issue, please temporarily turn off all the AVG shields as mentioned in the below article and check if that resolve the problem. If yes, please narrow down the shield which might cause this issue and revert to this post.
Temporarily disabling AVG AntiVirus protection
Meanwhile, I'd recommend you to contact the Microsoft support and report this issue.
Thank you.