I have had a lot of trouble with phoenix. The biggest issue being that it oftens gets stuck on "[0 Khash/sec] blah blah" and never reconnects to the server. This is especially bad when I have torrents running, even when I limit torrent traffic. The only reason I put up with it is because phoenix supports the phatk kernel, which gets me an extra 20MH/s per card.
Well, I got tired of it, so I forked poclbm and hacked it to support phatk. Here's my fork:
https://github.com/progranism/poclbmSo 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.

Thanks so much, I have the very same issue with phoenix getting stuck and making me lose hours of mining (even running several copies for each gpu is not enough since all one of them can hang if left running long enough).
I'm going to test this right now.
spiccioli.