You don't say what thread you're using. I never used to be a 'believer' that machines did not 'like' certain threads, always assuming thread breakages were due to tension issues. That was until I tried to LA with Aurifil (yes - Aurifil!) on my LQS Gammill. Snap, snap, snap.
I'd used it a few times before with King Tut and YLI and think I might have used a Connecting Threads one I was gifted too. Apparently it hates Aurifil, but Gutermann is OK. Still reeling (no pun intended).