Delta T17T038 Chrome Manual 1-Handle Shower Valve Trim

The screw under the temperature control keeps coming loose. I have had to replace numerous parts on 3 different occasions. Thankful for the lifetime warranty. Nice looking, functions are fine, but poor design.

I bought this last year as we planned to renovate our bathroom. We finally installed this late in the year as the valve trim is one of the last pieces to go on. For the first few months,(winter time) the valve worked great. Always the same temp, but the pressure would be a little lower on the second shower of the morning. It kept getting worse. Then after a few months, the pressure was a trickle, barely enough to rinse shampoo out of my short balding hair. Now I get 2 options, either pure cold @ full blast or hot @ a trickle. Since I have full blast cold, their is obviously nothing clogged in the showerhead, so that's not the issue. This unit is fed after the hall bathroom sink, but before the master sink, & both of those faucets work perfectly fine with both temp & pressure, so that's not it. This is shower only, no tub so there's nothing else in the way except this faucet. So I started reading the bad reviews for the unit, there are a lot of the same issues, people complaining of low or no pressure. A few said that the temp controlling cartridge gets stuck, so I took the palm of my hand & gave it a whack. Now I get more pressure, but if I turn on shower at a temp & leave it for a few seconds, now o can no longer change the temp of the water. It's stuck at that temp. If I turn off water & wait a couple minutes, still no change in water temp no matter where you set control lever. Why is this even possible, I get either cold full pressure or hot trickle or better pressure but at whatever temp it feels like giving me. There are a not of good reviews, but pay better attention to all the bad reviews also before you purchase. I'm now stuck with a useless shower unless it's super hot outside or if I don't actually want to rinse off. Oh yeah, I can also play roulette & gamble on getting frozen or scalded.