I got 12 block Erupters that I bought back in Aug. they were working fine till a few weeks ago. I can't figure out what's wrong with them. I had them plugged into a Raspberry Pi running cgminer.
When I try to run it now, I get a error ffffff or error 000000. If I put in each miner individually they work just fine (tested each of them for a hr+ and no issues).
I tried a different PC with the same usb hubs and same issue
I tried the same PC with a new hub and same issue

Any thoughts on what could be going on? If it was the miners, then they wouldn't be hashing. If it was the usb hub, then replacing it would of fixed the issue. If it was the program then a new pc or usb would fix it....