Buffer issue I think but don't see why

It's just that it looks like I'm running into a buffer issue when I don't think I should. I transferred some wavs.I am using drums (5 tracks), bass (1 track) and NO effects. I can't even play that back without the transport blinking red, freezing up and dropping out. I've used triple the tracks with effects on other songs and never had this problem. Any ideas?? Thanks, Alec

Buffer issue I think but don't see why