Garage door stop running when light went off

My Genie garage door is not action normal these days. It runs smooth pretty most of time. But when the power head and wall unit's light went off, it stop running. Just like it complete out of power. When it stop running, the safe-t-beam light went off as well. When that happen, either you press the button to get door alive again or wait few minutes to get the wall unit light back to normal.
Any idea what cause this malfunction? I know it is not out of electricity, since all other things run smoothly in the house. Thanks.
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Maybe a loose power connection. Vibrations cause momentary power loss and system resets.

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