I have a craftsman 1/2 hp garage door opener . Lately when I shut it- it will go back up. I have to hold the main switch to close it sometimes. Sometimes the garage door works without any problem by just using the remote. I check the 2 sensor. One sensor(green led) when I block it - it blinks. The other one when I block it the green led stays on regardless of what I do. I clean both sensor. What is causing my problem? thanks
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