Monitor flickers after waking up on first boot but not after restarting the monitor

Hi everyone,

I have a very weird Issue and am not getting anywhere with my search queries. I have two Dell monitors of a different model (One with higher specs for gaming, the other as secondary). I ususally keep them turned on, as they go to sleep when I shut down my computer. However, when I start my computer and the secondary monitor wakes up, theres this whitenoise all over the screen and it flickers black and white in randomly sized horizontal lines. When I trun it off and on again it runs fine for the whole day with no flickering at all. Is this a hardware issue? the monitor is pretty new and still under warranty.

I've already tried different display drivers.

Primary: Dell S2721DGF Secondary: Dell P2720D

Thanks

Edit: I have since switched to a new PC and without replacing any cables or drivers the screen runs fine now after waking up.