Thank you both for the immediate response, very much appreciated !
I will run 3.95 for a while and see what happens, will report back either way.
It's not hardware and the only new driver is the Nvidia driver but the issue was there before that driver installed, aside from that it has been running for hours on 3.88.
CAB:
Running VPX 10.6 final (usual suspects all up to date), Pinball FX2, Pinball FX3 and I have PinUp running with the tables where I enjoy that addition (maybe 10 out of the 159 I currently have running).
40" 4K PF, 27" 4K BG, 15" DMD/Topper