MIDI dropping out

[rwinking]

I did a google search and found others with this issue but could not find a fix so I thought I would try here.
I recorded a couple of midi tracks and for three days I could play it back with no issue. All of a sudden both tracks seem to drop out momentarily and then drop back in. I read it may be an issue with samples, so I bumped it up to 1024 and no change. I can see the notes are still there. I tried commiting the track thinking that it would all be there, but nope, it dropped out on the committed track.
I think this is fairly common, so I would appreciate it if someone has a simple step by step fix on this.
Rick