[kwikbreaks]

I'd guess that the most likely cause of the problem is going to be the Superhub switch mode PSU. It's even possible that it blipped in some way and caused your connection to drop. Try making sure that the homeplug and Superhub PSU connections to the mains are as physically separated as possible if that is in any way possible. What does the utitility that comes with them say the are syncing at? If this were me I'd try a different PSU but I can't advise you to do that as I've no idea if you have anything suitable or would know if it was OK to use.