I am thinking of the same thing because just recently the OEM power adapter for my USB Hub started not to produce the amps needed and in turn only 3 of my Block Eruptor were working and the forth were tring to mine but the green LED stayed on. I had to find another power adapter which I did from a OLD Linksys Wireless B Access point which was 5V 2.5Amp which could support 5 BEs and they are happy and mining at full speed and no errors