We have been in our house for 7 years. The master shower has been reliable until the last couple of weeks.

We turn on the hot water and unless we max it out, it stops in a few seconds. It even happens when taking a shower and the hot water has been running for more than 3 minutes. It also occurs when I turn the water diverter handle.

Wife is very unhappy with situation, which makes me really unhappy with the situation. Help, guys!