Hi, I am using my new USB Asicminer block erupter which has a hashrate of up to 16gh/s. After setting up everything with USB to UART Bridge VCP drivers it started working perfectly with BFGMiner with around 12gh/s, which was fine. It was getting hot so I used a usb driven fan to cool it.

After an hour I came back and noticed that the hashrate fell down to 6gh/s and slowly went down more and more. It was getting lower and lower but also falling down slower and slower. I tried another computer, but the same thing: After a few minutes the hashrate steadily got lower. Also the miner doesn't blink with its blue light as it did when it worked heavily, it's also not hot at all any more. Does anybody know what to do to keep the hashrate up?

Clock speed is set to 200 as suggested by BFGminer for compaq devices. Also the results are the same wheter I use the USB 3.0 ports directly on the computer or a fast external USB hub.

Thanks in advance.