The microwave in my house is less than 3 years old. I have been noticing that the clock will reset which happened couple of times (note that I didn't lose power in my house). Last night I woke up at night due to beeping sounds coming from the microwave. I went into the kitchen and saw code "F2", then I saw the clock reset menu. I unplugged it from the elictricity. This morning I plugged it back in but I'm concerned that there may be a problem or shortage in the unit. Please advise if I should be concerned