You've configured something wrong I think. Small block erupters don't usually fail unless settings tell them to do something that is not in their ability to do. The U1-U3 range though has so many stability problems it's quite impressive actually. I've figured out exactly how many times I must plug and unplug my U3 for it to work. (About 9)
The settings are These are MY settings. The 237.50 and 820 are variables.
The volt setting doesn't usually work unless you have a modified miner, changing voltage has to be done manually.
(Note: My miner gets quite hot, meaning don't leave yours on wood or anything without proper sufficient cooling!)
You can change frequency to what you want, just don't set it above 250 or expect fireworks.