They are probably not strapped in the wall. If you have a quick closing faucet, there may be water hammer.
A poor plumbing job. The pipes to the shower & sink share a pipe to the water heater and the pipe is not large enough. This causes the water pressure in the pipe to drop when the hot water is turned on at the sink while the shower is also on.
It doesn't but you better run sir/madam their may be a ghost in your bathroom.
The shower is turned off but the water is still running because there may be a leak in the faucet or showerhead, causing water to continue flowing even when the shower is not in use.
the shower might be turned the wrong way so they can't use it or something could be blocking the shower the path to the shower.
Its a loss in water pressure to the shower.
The shower head drips because of a faulty seal or worn-out washer that fails to completely stop the flow of water when the shower is turned off.
An electric field causes electrons to flow when a switch is turned on.
An electric field causes electrons to flow when a switch is turned on.
An electric field causes electrons to flow when a switch is turned on.
Your tub faucet may be leaking when the shower is turned on due to a faulty diverter valve. This valve directs water flow between the tub faucet and the showerhead, and if it is not working properly, water may leak out of the faucet when the shower is in use.
Water may continue to flow from the shower head after it is turned off due to a faulty valve or seal that is not fully closing, allowing water to leak through. This can result in water dripping or flowing out even when the shower is not in use.
Yes, remove your old shower valve and fit a new Moen anti-scald valve. This will not change when other items are turned on.