Pc randomly hangs or freeze suspecting of Ram or Psu

Pc suddenly starts to have issues like 2 weeks ago and continuing

1st: I noticed my game drops fps when i do certain task ingame like opening and closing inventory.

2nd: raised gpu temps i usually max out of apex legends (fps 1440p 180hz) temps at 65c, now even with airconditioning it reaches to 75c

3rd: while gaming the pc hangs for a while 10 to 20 seconds hangs then it goes away like nothing happened.

4th: one time i noticed my ram usage was 32gb maxing out even if my usual usage is around 20gb. This is only a 1 time thing checked for viruses and background usage but nothing suspicious so far.

5th: while gaming from just hanging to complete freeze requiring a hard reset on power button.

6th: while gaming pc suddenly shuts off then restarts. (Happened once so far)

Thats all of the issues i've encountered so far.

- Already update bios of gpu.

- windows memory diagnostic tool - results nothing found - standard

- repasted/clean gpu temps

- recently replaced cpu paste

- check hard disk sentinel for the health % of ssd drive, OS drive has 98% health, 1 terra ssd has 78% (this is all of the games are in)

- no bsod so far

- stress test with heaven and cinebench both running at the same time but no craches, hang, or shutdowns

- haven't reinstall fresh os

Pc specs:

R7 5700x3d w/dual tower heatsink

6800xt

32gb ram

Win 11 os

850w msi mag gold psu

What do you guys think on what i should do more? Im planning to check the ram sticks removing one by one just to see. But im running out of thoughts here. I really do hope its just the ram cause if its not its gonna be quite expensive to replace.