I'm experiencing an interesting problem where occasionally my FPS crashes from a steady 60-70 to <20 regardless of environment or situation. I can't seem to replicate it at will. I can instantly fix it by switching my video settings from fullscreen windowed to fullscreen or vise versa.

There should not be a CPU or GPU bottleneck running on i7-3770k and 1070. The issue seems to be independent of graphic settings anyway.

I didn't find much on google. I've been away from Rift for a long time, is this a known issue that might have a workaround?