Since last update, I've had this issue with all android devices, running versions 5 and 6 of android.
Often, when I click on a button on the lower right to attack or use an ability, this happens and I'm stuck having to exit and start LOTB again (and I lose access to a trooper I've used from a friend).
(i have cleared cache and rebooted the devices, but the issue keeps happening, multiple networks as well, wi-fi and mobile data network)
I'm stuck here with the 'bobbing' animations going on but no ability to do anything.
So far, this only happens on the boss waves.