I verified that the OP is willing to listen to all possible ideas about this case, so I will give you a summary of my case.
First, I will tell you what I tried.
I also did it like most, I tried more than 5 complete PC constructions, more than 6 ISP's (fiber, common cabling) all available in my region, I tried dozens of mouse / keyboard / headset, different steam accounts, windows, I also tested UBUNTU, and other things...
I tried 4 different places (family house) 2 apartments built new in 2016, and two normal houses built in the 2000s'.
I tried UPS Online double conversion seinodal, tried furman mx8 and also mx10, tried Panamax M5400 PM.
I spent over 500U $ with electricians in my region to redo all the wiring and plugs and grounding in my house to make everything new, I explained to them my situation and they did everything possible to make my PC as isolated as possible from the rest of the circuit of the house and my neighbors.
None of this really helped me, everyone gave the result as a placebo effect or some change as well as touching cables or making any changes in software / hardware.
Now the external things I tested:
I was a tier 1 player in Brazil until 2018, I played some important national lan tournaments among other things, I had this problem since 2011 (cs 1.6) and it went with me to CS GO in 2018 (That's when I decided to stop instead CS due to this problem)
I also believed that this was something electrical (even testing different locations and houses and different locations more than 20km from my home and the problem always accompanied me)
I have friends around me, playing their games perfectly and consistently as they should be, and yet I was blind and decided to believe that this was something electric.
From 2017 to 2018, I played some amateur tournaments because I was already exhausted from this problem, I was just playing for fun, but competitively.
In July 2018, I was called by a friend who was on a tier 1 team in Brazil, where they would have their own gaming house in downtown São Paulo (where the best players in Brazil are located, including FalleN and coldzera when they lived here )
So, as I was still believing that the problem was electrical, I was sure that my problem would be solved, and I could play normally, I would travel 600km where most of the Brazilian CS scenario is located.
They provide me with a great structure, top-of-the-line PCs and the equipment I choose, I didn't need to take anything that was mine.
I stayed there for 3 days, as I am tired of telling / dramatizing this story, I will summarize.
The problem appeared, after 2 days, all the other 10 players (9 players and 1 coach) had their PCs working perfectly as butter, and there were also some streamers, all happy with their PCs working well.
I lost my mind, decided to reinstate my contract and did not do any more tests, in 2018 I abandoned CS: GO altogether because I saw that I could not solve this problem regardless of how much money I spend.
I was able to play lan tournaments because they were never more than 1 or 2 days old, and I always played on different computers and it wasn't enough time for the problem to appear.
So, after all, my theory about MY CASE, is that the problem is caused by me, for some reason I am the reason why this happens.
I would like you to talk more about this case in 2008:
matter with video: https://www.techeblog.com/video-12-y...ith-computers/