My Rheem (gas) started doing that a while back while still covered by home warranty.
As someone above mentioned, the heater was not seeing enough water flow and would shut off the burner.
It was due to the “water saving” restrictor in the shower head .
Once I removed the restrictor from the shower head to allow a better flow, the problem disappeared !! Now I can better control the flow at the head.
Another tip regarding the length of time it takes to get hot water to the furthest faucet ….usually the master shower head……
Tip: when ready to shower , run your shower on full hot AND one of your bathroom faucets on full hot as well.
With the restrictor removed from the shower head we get hot water ready to go in about 45 seconds…..no BS
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