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I recently changed the valves in my master bedroom shower. The cold works fine. The hot shuts off when I turn it on too quickly, like it is air locked. It only happens to this shower, no other and no other sinks.
What make faucet is it? It sounds like the balancing spool is frozen. If it's Moen change the cartridge.
I also agree with johnjh2o, just change the cartridge.