Update
More exotic Problems
Driver 19.9.2
Win10 Edu - 1903
After some random use time, the GPU reports 100% load, which it clearly is not because 100% sounds much different fan wise. Then image out to all monitors is lost and the system will not respond to input. Audio out will continue to operate as normal.
Looking at HWinfo logs before a crash, fans and temps are fine (35°C CPU, fans in the 400 to 550 range, VRM 50s range, 45°C GPU, fans off).
Also: According to event viewer, seconds (more like miliseconds) before disaster, the network connection drops or recovers to gigabit full duplex.
Halp!