In the event it is useful to others, I thought I'd share to others that I was experiencing momentary pauses in the video about once every 15 minutes. The pauses would persist from 1-4 seconds and then continue. The audio would not stop during this process. When this was occurring, I was booting off a USB thumb drive.
I have since installed PMP on an internal SSD disk and all of these momentary pauses have been eliminated. So, if anyone else is having the same issue and are booting off USB, that's the likely culprit.