el_supremo:
I thought my previous post had answered that - maybe I've misunderstood the intent.
The intent is to isolate the problem. Connect the three boards to the hub but do not have the hub connected to the computer. Unplug one board. If either of the boards still connected to the hub resets then the culprit is either the hub or one of the boards (my bet is on the hub). Repeat for the other two combinations.
If the problem does not occur with the hub disconnected then the problem is very likely with the computer.
I suggest also trying different USB cables.