I will agree that this is something going on in relation tho the recent Windows update (May 9-10 update). I am unable to fully confirm it since 1. I fail at using system restore and 2. Windows 10 does not allow complete rollback of updates.
Here's my rig;
i7-7700k at stock
GTX1070 at stock
32gb Dominator SPD
Last night I had planned on hoping on Elite Dangerous. Last week when I played, there was no issue. This time, OBS indicated the output framerate was all over the place rather than outputting a smooth 60. And thisbwas while it was just sitting there. No recording, no streaming, nothing. I did the usual routine of switching encoders and removing sources to troubleshoot and no effect.
Curiously, I opened GPUZ to see if something was up with my GPU. Everything was reporting normal. I ran Firestrike + stress test; no issues. Ran task manager and Adata64 and started testing the CPU; no issues.
Curiously though, I switched over to Shadowplay and attempted to record with that. The behavior however was nothing I've seen before. The video would skip and stutter over entire portions of the recording. That is to say, the timeline of the video would jump forward at random spots.
Once more; I wasn't experiencing any issues prior to the May 9-10 windows update. From here, players for team green are mostly affected, but I've not seen anything substantial on the Nvidia forums as of yet. I can only go by the assumption that the Windows update has broken something.