[sOLUTION] at least for me.
Background of issue: after 20-30 minutes my vive would grey screen more and more frequently until unusable.
Solution that worked for me- covering up one of the front bottom sensors on the VIVE headset. I read in another forum somewhere that someone had similar issue and they would cover up one of the front bottom sensors and then they wouldn't ever encounter these issues anymore. What I did to figure out which one to cover up is just use my finger to test out different sensors. It appears that this solution actually works by covering up one of several of the front bottom to bottom-middle sensors. I chose one of these sensors and put a sticker on it and now I don't have this issue anymore. Really strange.
, hopefully this info helps. any idea of why covering up just one sensor of several of the bottom sensors would fix this issue?
Best,