Audio track cuts off... ?

Hey everyone. I've been a Fantom G8 owner for 3 months now and this thing is THE BOMB! Me and my band record all of our songs on it and everything has been running smoothly... until now that is. I'll often find that I'll be in the middle of recording an audio track and recording will stop automatically before I'm finished. I'll get the usual message though: "Would you like to assign the new sample to track?". I'm really confused, maybe I'm doing something wrong? I'd appreciate any advice. Thanks