Media Playback.

So I have noticed that 'before' the videos I would playback for a song or scripture would play once fine and then maybe lag like a 1 seconds and play again in a loop for the res of the service. But 'now' I see the video payback lag every so few minutes, and for 3-5 seconds.

So I am not accelerating the video or anything, I just play it and it lags.
It affects me for I use an intro video of my churches logo and the source video is fine of course; I also use a video playing back for songs and scriptures, it does the same with my three videos I use.

Is this something windows related, that I could somehow help?