I'm using a mix of Phoenix/polcbm-mod on my machines, but unfortunately my main rig is having hardware issues and will error out after several hours. I tried resetting my bios to factory settings (no overclocking) and maxing out my fan speed. That seemed to help a little, but still after maybe 5 hours it will inevitably decrease by a factor of 10 (!). Obviously I don't want to keep it mining at that rate, and there don't seem to be any ill effects when I restart it. The only thing I haven't tried is underclocking the GPU, which I'd rather not do since it should be running fine at stock settings. My case has very good airflow, so I don't know what's going on. Anyway this is a separate issue so...
I'm this close to creating a python/ruby wrapper just for this machine that will kill/autorestart when this happens, but it would be nice to have some built in support (warnings, stderr) if we get a hardware failure or our Mh/s is very low. Is there any tool that does this?
If I have to write one myself, I'll release it to the forum in hopes it will help other people with hardware woes.
What card brand and model are you using?
What do oyu have clocks set to?