Stuck in buffering

Hey guys. New to this forum. I’ve had my elite gen 2 for a few months now. Running it from a laptop with realtime cnc and using a makita router for a spindle. I’ve had issues a few times with it just getting stuck buffering and no choice but to shut it down and rerun the program. It just happened in the last 10 minutes of a 4 hour 3d carve. I’m wondering if anyone else has ran into this and what can be done to resolve this issue. Thanks in advance!