Just wanted to share something I discovered this week in case anyone else is having the same issue.
I updated the presentation on one of our stations. Added 4 new videos (.mp4) and there were also about 5-6 other .mp4 vids on the same timeline.
Problem was that after the update, ALL videos were stuttering or cutting in and out ever other second. Even those which were playing fine previously. I tried emptying the cache - didn't work. Then I un-installing and re-installing the Signage Player - also a no go.
Finally figured out that the source was the remote desktop client I had installed on that machine. I had LogMeIn and Teamviewer installed as well for backup. I uninstalled LogMeIn and ALL videos went back to playing fine.
Still not sure why this had not been causing any issues for the last year, but it seemed to resolved this issue.
Just wanted to share in case you find yourself facing something similar.