I just moved back into my completely renovated house. I added a master bedroom suite with a beautiful bathroom (all new construction). Put California Faucets products in the bath, including a "regular" shower head, a hand shower, and a rain shower head. Usually, I just use the regular shower head. But whenever I'm standing there, the rain shower head starts dripping cold water on me. Mind you, this happens only after a few minutes in the shower and it happens whether I've turned on just the primary shower head or just the hand shower - and despite the fact that I've not turned on the rain shower head in weeks. California Faucets set me a replacement cartridge for the rain shower head and this was installed - but if anything the drips are more frequent. What might be the problem?