Hi there, I've been doing some recording of songs using GarageBand and suddenly on this one track, it refuses to play some parts sometimes. To give it some context, it's a cover of Billy Joel's 'You May Be Right'. Everything seemed to playing fine until when I thought I'd finished and went to play it back. I played it from the start and the glass smash went fine but the kick drum and snare tracks just silenced for the whole measure. They do play if I start playing from the second measure, skipping the smash but then the kick, snare and cybal tracks on the first count of the next measure don't play. Also at random points, the rhythm guitar track just won't play then it will again. The same thing happens if I solo the tracks, no change. The waveforms are there and they're not muted, down low or overly panned. Any reason for this glitch and way to fix it?