Hello. We are on well water, have copper pipes, have a water softener, and normally have regular pressure even when a shower, washing machine and several faucets are running. We've suddenly started having low pressure problems intermittently, especially if a shower is running or another faucet is running. Our well pump pressure gauge is on 60 psi, and the pressure tank seems to run well. Any clues as to what's up, and any suggestions as to a DIY fix?