The light on the HUB goes out, or the light on the boards goes out? It might be an issue with hub itself. I can't think of any reason why it would want to arbitrarily disconnect. Now, if the power to the boards is going off, then yes it may be the circuit you're plugged into. I had that problem a long while back where a certain plug in my garage would get power spikes and screw with the power supply. Like Derek mentioned, try it on a different circuit and see what happens. Avoid any circuit that has large appliances or high draw stuff on it.
hello don't know if this is the right forum but here goes i just ordered the m3 kit bundle with upgrades i was wondering if there is upgrades i can get like motors and uno boards sheild i like the size of the m3 and my projects won't be larger than 10.25 is it worth updating these parts my plan is to use the M3 for modding computer cases and making my own parts and if so what parts would you recommend i get thanks