my panasonic aircon in my office the same issue as well, when i first turn it on in the morning, it can run for a few hours until it auto shutoff. When i turn it back on, the air coming out is hot, and turns off about 30m-1hr later.

My facilities guy said its the compressor unit overheating due to the capacitor failure. That's why the air coming out after that is hot.

Nothing wrong with the RC off timer.