Would you believe that I just didn't really know how to use my shower?
Yes, I'll bet you can all believe that.
I've been annoyed that the shower didn't have an on/off switch on the head, which meant my "navy showers" involved constantly turning off the water at the sink tap, which has separate hot/cold controls, so I'd have to re-adjust the mix many times during one shower.
On the shower head there's a dial. Two settings. One has several lines, the other is one solid line. I figured that meant two flow choices. One more of a mist, the other a stronger flow. But no...One is on, one off
I think while I was showering, the dial got moved just enough that it was getting into the off position, and shutting down the water pump.
Now I just need to figure how to put it back together right. I must have lost a part, because "off" is not really quite off...just enough water comes out that the pump stays on and I'm still wasting water when I don't need it. It's pretty simple inside the shower head and all I can figure is that a washer jumped out and lost itself somewhere...