Question After gaming for a while, the whole PC stutters even at idle ?

Jan 10, 2023
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Hello, I just got a custom PC built last December and everything was going well until one day I noticed that my game (mostly Overwatch 2 and Cyberpunk 2077) started to drop frames like every 2-3 seconds after a few hours of use and the stutter continues even after I exit out of the game with the only way of fixing it is to reset my PC every time.

These are my specs:
Motherboard:
MSI Pro B660M-A WIFI DDR4
CPU: Intel i5-13600K (undervolted to cpu lite mode 7 with boxed cooler option at 180W)
Cooler: Thermalright PA-120
RAM: 2x8GB G.SKILL Ripjaws V @ 3600MHz
GPU: Palit RTX 3060ti (2nd Hand)
Storage: WD 2TB HDD @ 5400 RPM and Gigabyte GEN3 2500E 500GB M.2 SSD
Case: Phanteks Eclipse P400A
PSU: Seasonic G12 GM-180 Gold 850W 80+ Semi-Modular
OS: Windows 11 22H2
Software for my peripherals: Razer Synapse, OpenRGB, Fan Control
I have 6 case fans in total with 3 intake and 3 exhausts.
I am also using a deepcool fanhub for my fans and a hub for argb ports as well.

Solutions I have tried so far:
Reinstalling GPU Drivers via DDU
Defragmented my storages
Replaced my HDMI to HDMI cable with a Displayport to HDMI cable
Tested my memory using memtest86 (tested with no errors at all)
Made both my monitors refresh rate 60hz instead of 60hz and 75hz
Used Rivatuner to limit my fps
Turned off/on GPU Hardware Acceleration in Windows settings
Disabling fast boot in Windows settings
Turned off Xbox Game Bar
Turning off FreeSync
Disabling Overlays Scanning for Viruses using Malwarebytes
Reinstalling my CPU chipset

My temps are all fine even under load since I created a custom fan curve for it and during gameplay, I monitor my PC using task manager and there's no unusual activity at all. This issue has become an unending loop and it's making me super depressed because this is the first time I have bought a custom built since 2016 and I hate that after all that wait, this is what I get. I would really appreciate any help that I can get!

Thank you!
 
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