PC Randomly going very sluggish/dropping frames

[EcKo12]

Seriously hoping someone has more of a clue than me as I'm out of ideas other than a format which I'm really trying to avoid.

been gaming most nights fine for the past 6months, then last week just started getting a huge issue where my frames drop to like 5-10 and it doesn't recover until I restart PC.

Started happening on League of Legends

Will be fine all night then few hours in just like 5-10fps and doesn't resolve until after I restart the pc.

Tried another game (valorant) and again was fine to start, but again started having similar issues.

 

Things I've tried:

Reseating GPU and RAM

Clean all vents/fans of any dust

Monitor GPU & CPU usage and temps, both appear fine

Updated GPU drivers

Updated chipset drivers for my motherboard

DDU drivers and reinstalled them

 

Any suggestions are welcome as I have no clue what else I can try or work out how to determine what the issue might be

 

My System:

Windows 10

ryzen 7 1700

rx580 8gb

asrock ab350m

EVGA 650 B3 BRONZE 650W

16gb ram can't remember the brand but it's 2x8gb matched

[SkillTim]

I found a similar thing with Fortnite. Things that might help:

Go to settings and turn off game mode.

Check your CPU isn't thermal throttling, use core temp because it could be one core getting too hot. Reseat CPU could help.

Reset any overclocks to defaults.

Update BIOS

[Heliian]

Check task manager for whatever is chunking it.  Check your CPU and GPU temps.  Check windows updates.  Check drive health. 

[EcKo12]

Thanks for the suggestions I'll try disabling game mode tonight to see if that helps.

 

I have been monitoring the temps and yesterday the CPU temp was 56C and the GPU was 42C so I don't think it's down to any overheating issues, unless the sensor is reading wrong possibly? 

 

I'll also give updating the BIOS a try