Most of the time I start a hosted session and then connect the two other iPads and all goes well. Other times within a few minutes one or the other, or both loose the session. Hitting close and rejoining works for a few min then looses again? I have found that when they loose the connection if I shut all three down, reboot the Host iPad, then the other two, then reconnect the sessions stay connected the rest of the gig.
I am using a 5g wireless router mounted in my rack of other gear.