I also noticed that from time to time...client goes into some sort of sleep mode...maybe after several unsuccessfull attemps of trying to get work data (server problem probably...or too many connections)...and....it needs to be restarted to startup again.
That generally wouldnt be a problem at all, but i lost several night of folding because this happened in mid-night...and i only found that out in the morning...cant they just let that "try to get work data" mode on nonstop...or to try every 10mins or so...