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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! The power cycle resets the electronics in the machine. Many things can affect the electronics, including poor connections. I would examine the cord connections carefully and make sure there are no loose wires or discolored terminals (indicating excess heat). If all looks good, you may have a control that is beginning to fail or it just needed a reset, which happens. Let me know what you find.
The sides and top will get hot, yes. That is normal. It was probably just a glitch in the electronics. Just like your home computer sometimes freezes up and requires a restart, the dryer also uses similar computing electronics.