Some will say it's a problem with heat, and it could be the trouble you're having.
However, I've had a problem with sporadic freezes with WarpUp since I got my first way back in the late 90s. I've tried some crazy cooling solutions, but no matter how cool I keep the processors, I still get freezes.
There's an LR bug which can cause lockups, but it supposedly only affects CSPPCs, and the fix which was released for it does no good on any of my systems anyway. You can read more about that issue in the docs that are supplied with the fix here:
CSPPC233FixI suspect there are still bugs left in WarpOS, but I can't give any further insight. It's just my hunch, and since WarpOS development is dead, I figure it's just something to live with. The bulk of freezes only happen when more than one PPC application is running, although SongPlayer freezes by itself once in a while.
...for whatever that's worth.