Heard DH howl as he was beginning his shower. Water flow had stopped completely for no apparent reason. Water flow was fine everywhere else, and there was no water under the coach or in the wet bay. So no apparent leak. Took a couple of minutes of head scratching
before we discovered the back of the shower head had a twist on/off flow control valve that was not noticeable (and something about which we were completely unaware). DH had accidentally turned it while adjusting the shower head position.
Though it would be good to share our experience in case it saves someone else some head scratching down the road...