Sudden GH/s drop in BFL Miner So basically I have a BLF non-Jalapeno variety 50Gh/s miner. I run cgminer and have recently been mining from ozcoin after eclipsemc was hit with a recent DDoS. 
Normally, I have been clocking at around 46.xxG-50.xxG/50.xx-51.xxGh/s. Last night I noticed a bunch of incoherent errors pop up on my terminal window. About 5-8 lines long. The miner would stall out, it dropped to around 18.xxG/19.xxGh/s stuttered around that level for a few minutes then slowly climbed back up to the rather disappointing 36.xxG-39.xxG/37.xx-39.xxGh/s I have been seeing ever since.
I've poked around looking for reason for this, and maybe haven't poked hard enough, but I am at a loss. Any ideas on what is happening?
Both BFL hardware and software are quite unstable, and depend on the starting temperature of the BFL hardware.

What you can do is: stop the mining software, power off the BFL miner, and stick the BFL miner in the freezer for 5-10 minutes (or longer, say 1-2 hours) so that it can cool down. 

When I got my 50GH/s, it could only run at around 25GH/s. Eventually, I found out that it is temperature sensitive. I have, once in a while, powered it down, put it in the freezer, and then powered it back up.

I get pretty impressive results that way. From an original of 8 out of 16 chips working, I now get 15 out of 16 chips working.