Strange Problem

I have jailbroken over 100 ATV2 since January 19th, all brand new.


However last night I had a problem with just one ATV2.


Firstly, the ATV is not recognised in ITUNES, i have restored it to factory settings via the tv and tried again to no avail.


When I do manage to get into DFU mode, it goes through the motions then gets to Itunes and does nothing.


The white lights on the front are flashing irregularly.


How can I work round this problem? Very annoying