We bought a log cabin 3 years ago and have just dealt with the water problems because it is something we can live through and we're afraid it'll cost a ton to repair. It doesn't appear to be a water pressure problem because it has great pressure when you first turn it on. But the longer it runs it slows down drastically or if you're washing dishes in the kitchen (by hand; no way we could have a dishwasher with this water problem) and someone flushes the toilet or turns the washing machine on the kitchen sink water flow gets very low and you have to wait almost 5 minutes for it to come back fully to finish the dishes. Same with our washer -- if you're filling the washer for a load and someone washes their hands in the bathroom sink the washer stops filling up and just says no water detected. Or you're in the shower and someone uses the water it slows way down too, and I also think the longer the shower is on the slower or lower the water you have. We have checked for a water pressure valve and we only have one up at the main. And it's been checked and the water company has checked to make sure it's open all the way as well.
We only have one shut-off in the laundry room for the entire house and it's just a blue knob you turn.
We have city water.
It's a 1-bath home. And it doesn't matter if it's the hot or cold water being used.
Any tips or reasons why this is happening?