beat some sense into it

is ur mouse cord in good condition

probs a psu issue. get a new one

it persisted over multiple mice and ports, so that's most likely not the issue

also my idea but since it's not the cheapest thing and i bought this half a year ago i'd like to be sure, is there a way to test this?

out of all the things that could go broke, psu is the cheapest haha
but to answer your question, no idea how to test it. get it in another pc?

I would..
check your temps. if they are fine then:
take out your video card. and all but 1 slot of ram. unplug all your shit except keyboard. close any progs like mouse drivers. see if it still does that.
if it does, swap the ram, and check again.
if it still does it then its prob mobo/cpu/psu.

the common psu test, the paperclip test, isnt going to do anything. since your computer turns on and all that stuff. I would be more inclined to think its mobo of the remaining. cpu almost never break and seems like a weird problem for psu but idk im not an expert. ofc if you have a spare psu, test it.

thanks for ideas
temps are fine, around 60° C for CPU and 55° C for GPU
im using one ram stick and swapped slots some time ago, no effect
i've tried launching in safe mode, still the same
i'll try without gpu next thing in the morning

im using igpu for my second vga monitor and while using only my 1060 it feels like it's happening with lower frequency

ok, so for SOME reason after i updated windows to the latest version, it's not happening anymore
i'll see if it sticks but thanks to everyone who tried to help

thank god, could have been some buggy ram

No.
If you pulled the plug for 1-2 seconds it wouldn't stutter either, would it?
No power means the hardest of hard crashes, not just a little stutter.

Image + sound or just sound dying is usually just nVidia drivers vs Windows 10.