Please help me with this problem!

After a while during a game, memory read and write speeds drop, and latency increases. This happens completely randomly, sometimes it happens, sometimes it doesn't. Under normal conditions, depending on the game, the graphics card is at 100% load, and the processor at 40-70%. Then, suddenly, the graphics card load drops to 80%, and the processor operates at the same load, at approximately 80%. Consequently, in a game running at 144 fps, it suddenly drops to 80-90 fps, and this is very noticeable on a 144 Hz monitor. At first, I thought it was the graphics card, but then I started measuring the speed with AIDA64 and realized it was a memory issue, maybe even a CPU issue…

I searched the internet for various solutions: changing the memory frequency, overclocking the CPU, resetting the BIOS and restoring it to default settings, changing the maximum power supply wattage, overclocking the graphics card, running games without the system tray (Razer, NXT, Nvidia App, etc.), reinstalling drivers via DDU, checking for errors with OSST (CPU + memory) – no errors, and running AIDA64 – no errors either.

I also haven't noticed any issues with temperatures under load. The CPU reaches 82°C, of ​​course, but very rarely, usually 75-77°C. The graphics card is liquid-cooled, so temperatures are 54-56°C. If it's just overheating, then I think when the temperatures drop, the frequencies recover, but here it's like the memory is cut by 20% and that's it until I reboot the PC again…

I've tried everything except reinstalling Windows, but I really don't want to do that…

My PC specs:

Operating system: Microsoft Windows 11 Pro

Processor type: Six-core AMD Ryzen 5 7500F

Motherboard: MSI Pro B650-S WiFi

Video adapter: NVIDIA GeForce RTX 2080 Ti (11 GB)

Monitor: LG 34UC89G

RAM: 32 GB 6000 MHz Team Group T-CREATE Expert White (CTCWD532G6000HC38ADC01)

HP SSD EX900 Plus 1 TB Solid State Drives – 2 pcs. Hard Drive: WDC WD60EZAZ-00ZGHB0: 6001.1 GB

Power Supply: 1STPLAYER NGDP 850W

This most often happens in the following games:

Arc Raiders, Division 2, World of Warcraft

I haven't noticed it in offline games, but I haven't played anything like this in a while.