I know that when you get a lot of errors your quota is set lower to avoid your processing more files but I noticed something. I've gotten a couple of quota messages but when I check the task itself I see a string of "error while computing" which would seem like the task itself is bad. In the last case I checked, i was the fifth one to get an error. That may be counter productive in that more computers will be flagged as in error when the task itself seems to be in error (BTW, I'm no overclocking at all and temperature is always under 70 centigrade)

Try to check other tasks, not only that one, you can see than older tasks are successfully finished by another crunchers.

Actually I did that. For the tasks that show as errors on my computer say on January 30th. There were three of them and none of them show successful completion. I spot checked others as well. I could do the analysis if it would help but it looks like a large percentage have at least one error while computing before they have a completion.