Delta shower slowly goes from hot to lukewarm

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Chrisexv6

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Delta Monitor 17 series with R1000 rough in valve. As we take a shower, the first 10 minutes or so are fine. After that, you slowly need to turn the temp control to the hot side to maintain the temp, but then eventually even that doesnt keep up anymore.

I initially thought it was a problem with the water heater, but as the shower gets cooler, the sink (same bathroom, 5' away) maintains very hot water....MUCH hotter than the shower

The cartridge is installed correctly. Ive made sure there is good flow through the valve (without the cartridge installed I opened the service stops and let clean water blow through). The cartridge does rattle if shaken while uninstalled.

Any ideas?

Thanks.

-Chris
 
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