I tried running three on the recommended Orico USB hub (http://www.amazon.com/gp/product/B00EH44AA6/ref=oh_details_o07_s00_i00?ie=UTF8&psc=1) and still have problems if I ever run more than two at a time on the same hub.

I've ordered an Anker 9 port hub that has a lot of power, maybe that will do better.