Customer Service - Sound cutting out repeatedly on DVR recordings

During some DVR recordings, the sound/audio cuts out for a few seconds before coming back. This has been happening during the last few weeks.

At the precise moment the sound cuts out I can also notice a very slight change in the video resolution. But the video never stutters or glitches in any major way..  just a very slight drop in resolution. 

The sound however is a 100% cut in audio for a few seconds before it comes back. This is very annoying obviously.

Please advice regarding a fix. 

Here's a link to a Xfinity forum issue post that describes the same problem I have. https://forums.xfinity.com/conversations/x1/audio-cutting-out-for-last-2-weeks/603e57dbc5375f08cdc1188e

Thank you.