Ok day recap: been using my PC for like 12 hours today, without using the nodma
variable, no "random" hangs appeared on the desktop, I will make another reply
in a few days if things keep like this, hopefully they do.

Considering that Rocket League launch still provokes the SDMA type hang I'd
suggest to leave this bug report open for further tracking and tracing the
remaining "non-random" SDMA bugs.