As much as I hate to repeat myself I posted a review of the Juiced 10-port hub in another thread(
https://bitcointalk.org/index.php?topic=263577.msg2824064#msg2824064) so I'll paste it here:
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I bought the Juiced 10-port from Amazon and suggest getting something else. It'll run 8 erupters but when you plug in a 9th it starts to lose contact with one, then another, then another and the only way to fix that is either restart cgminer or unplug/replug the miner. The Anker's extra amp makes a big difference.
Adding insult to injury my Raspberry Pi can't see this hub at all, so I think I'm going to order the Anker from Amazon and return this one.
I am having the exact phenomenon that you describe with the Anker. The problem goes bad to the point where cgminer core dumps. (currently investigating the core).
with 10 miner on an Anker made the problem very fast. Currently run with 9 and the problem happens anywhere from half an hour to a couple of hours.
I originally tried to plug 8 Erupters + an Artic Breeze fan and I was still seeing the problem. Should try 8 without the fan.
I'm maybe wrong but I believe the soft may have a part of responsibility in that or it could improve how it deals with it at least.
Which OS are you using? I do use Linux.