I have suspended DCS.exe which is the process for Digital Combat Simulator, running the latest stable version.
Prior to suspending DCS.exe, I have set it's affinity via Current, to 0 and 1, as well as setting OBS64.exe to Current affinity to 3 and 4.
I'm running this currently with Core i7 3820 with hyperthreading disabled, on a machine Windows 10 Enterprise LTSB 2016 (1607 - 14393).
The big problem is, the process cannot be resumed via Resource Monitor nor Process Explorer.
History, the only thing that changed is probably GPU drivers and the DCS version, which updates come for almost every month if not twice a month.
I might have to check logs for what was the previous verison of, but I did use the same version from months ago when I did a lot of DCS testing for a few weeks, at least I think so, I think it was .1 instead of .4. - I updated it via autoupdate a few moments ago, but didn't change anything regarding to this.