Well, I got tired of it, so I forked poclbm and hacked it to support phatk. Here's my fork:
https://github.com/progranism/poclbm
So far so good, poclbm is happily running without any issues whereas my phoenix instances are freezing up MH/s is about the same. 339 MH/s instead of the 340 MH/s I get on phoenix. Close enough.
Lemme know if this helps anyone else.
I never had a problem with phoenix locking up...
Every how much time it should happen?