Replace Internal Kohr Mixing Shower Valve. I was having issue with the Water getting Hot and Cold Randomly and also issue with the shower not getting very hot. This New Mixing Valve seem to do the Trick!

Product Info:
Kohler GP76851 Repair Kit for Single-Handle Pressure Balance Valve
https://www.amazon.com/gp/product/B001GZU9FY/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
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