"Bad" performance on newly built pc

I've built a new pc recently and after using it for a while, I've noticed that the performance is lacking considering the specs of the build.

If I leave my pc idle for a bunch of hours(overnight for example), the computer starts to stutter on basic tasks and in game, if I restart my pc, things get better but it's not ideal. Another nitpick would be that when my monitor fades for a long period of time, every application moves to the primary monitor.

My old build didn't have that kind of problem and nothing indicates any problems, my temps are fine(under load and idle), benchmarks are fine.

PC parts:

* i7 12700k * ROG STRIX B660-A GAMING WIFI D4 * XPG Rog Strix 16gbx2 3600 cl18 * Corsair RM850x 850W * AIO 360mm Zeaginal sakura hitomi * RTX 3080 yeston sakura hitomi * SSD Netac NV7000 2tb * Windows 11 pro (latest updates installed)

I'm leaning on being software and not hardware related, some help to diagnose and fix would be appreciated.