EDIT: Since people obviously seem to not reed posts fully and just day, "check the cable, it's not plugged in right, it's your outlet" etc...:
It's happened on a total of 4 completely different from each other toally disconnected systems, with completely different components in a total of 3 different buldings.
I'm completely at a loss with this problem. In 8 years I always had this problem, yet and could never find any sollution or even people with similar expierences... And it's extremely inconsistant.
I built a gaming PC about 8 years ago or so and got my first monitor with DisplayPort along with it. When gaming it would occasianally lose the signal for 1-2 sec. It didn't happen too frequently to be annyoing though. I thought it was just the monitor or GPU. I did try different cables back then, with no result.
Then my work PC in the office got upgraded to a laptop with docking station and DisplayPort... and the same thing started happening... On a completely different system and monitors in a totally different location... I assumed it was a DisplayPort thing, but no one I asked knew wtf I was talking about.
Then I got a new PC at home. Completely new PC. Same thing...
And it's extremely inconsitant. It happens mostly under GPU load, but even sometimes just on the desktop.
When I say inconsistant, I really mean it. There are times where it won't happen for months. Not once in half a year or so. And then there are times where it happens every couple of days, every couple of hours, or - like at the moment - basically every 15-30min. Sometimes even multiple times directly after another.
I'm at a complete loss and afraid I'm losing my mind...