Recently I drained and flushed my hot water heater, while I was at it, I replaced both upper and lower elements (electric hot water heater). My family was complaining the water wasn't hot enough before so I turned up the heater to around 135 (I know it is pretty hot), now, when I turn on the faucet, single handed, in my master shower, once the hot water comes to temp, it begins to whine. If I turn only cold water on, it doesn't whine. About 6 months ago I replaced the cartridge in the same shower with no issues. What could be causing this and why just after I turned up the heater? Thanks!!