The quest appear to have a memory leak. This can be shown when using the OVR Metric tool. When launching an app onto the device it appears that he memory usage goes up every 20 seconds or so.
Setup Before Testing:
Result: The V memory (Upper right corner) will continue to tick up every ~20
Expected: The amount of memory being used would remain constant when no changes have occurred
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-79845 in the post.