hello, i also had this phenomenom randomly at really annoying times when i put two speakers to my equipment which draw a lot of power. Everything was on one socket, socket distributor. I searched on gutefrage.de and there was one guy also having it with much later equipment: rtx 3090 and brand new pc, so old components could not be it. So I changed the socket distributor and since I did not have it. Seems like my previous one was not good enough to handle all this *****, i bought it at a discounter and it also seems really *****, if you ask me. Also, I might add that the computer went a bit slowly before (latency when hitting windows key and latency on programs)and I reinstalled windows and stuff, never thought it could be a power problem. Well, this changed the game for me. You might try this.