Kitchen and bathrom taps stop working in one time

[NarubyFulltimefamily]

Hi, we are Grand Californian on a roadtip in Spain and we are having water problems. Already on the third day, it happened to us that the water taps did not start the pump. Outdoor shower and toilet are fine. So we found an emergency solution - let's run an outdoor shower without a hose and the water in the kitchen or bathroom flows. But this is a very strong way. This has happened twice before and each time it "fixed itself". But now it didn't fix it. Any idea what it could be? the strange thing is that the pump is running and the current batteries in the bathroom and kitchen do not always work - so neither the faucet nor the pump is broken. advice much appreciated, with two kids on the go water is really helpful!