For some reason my units are dropping like flies.  In the past 24hr three units have burned the USB ferrite bead.  I can't seem to make any connections for why this is happening, one unit has VOLT mod 1; two bridges, has been running for a month.  The other two have "R-52 or R139" mod with 47k and 50k resistor, also been running stable for a month.  None of the units shared the same USB hub so I crossed that off the list of possible failures,  two shared the same power supply but the ferrite bead that burned is for the USB hense 5volts so not sure if that would have mattered.  I am lost finding any correlations between the units that failed, possibly just a coincidence or a weak part, but its suspicious that 3 have failed in the past 24.  We shall see, now have to order new parts and wait to get them back online.