That server sounds a bit older in the teeth… Has new thermal paste been applied to the cpu? Even if the reported temps are under 90c, you might be getting hot spots causing glitches inside the package.
Worth trying a couple of different generations of kernel as well, both newer and older. You might be hitting a regression somewhere.
“Choose interesting jobs”
THIS! A MILLION TIMES THIS!
The absolute best career choices I’ve made, in hindsight, were always from the interest in the work or quality of whom I was working with.
Took jobs for less pay, even turning down much higher offers, to choose the gig that was in the area I wanted to expand in.
Never accept just based on “it’s a few bucks more”. Unless it’s twice the pay AND you have something else to gain from the role, always grab the better experience or less stressful spot.