I have Delta shower fixtures. The on/off/hot/cold knob has the push button diverter below it. When the diverter was pushed in only a little water came out of the faucet and a drizzle out of the shower head. I replaced the diverter. With the water running from the faucet I pushed the diverter button and the water came out of the shower head as it should with no water from the faucet. Turned off the water, the button popped back into the 'unpushed' position. Tried it again, the second time it failed to work properly - same problem as before the replacement; little water from faucet and a drizzle from the shower head. I uninstalled the diverter and reinstalled it. The first time it worked perfect -- the second time it failed. Any suggestions for a fix will be appreciated.