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880LM Flashes and does not open after a few times

I have a 880LM control Panel connected to a 8550W Garage Door opener for a bout a year. Recently, I noticed that when I hit the button on the Control Panel to open the garage door, it flashes the screen and does not open. I have to hit a few times until it opens and works normally. I have the 893LM remote and never had a problem with it.
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