I have a DC motor, belt drive Chamberlain opener roughly five years old now as our main garage door opener. For the past 3 months or so it requires reprogramming all of the remote openers about once a week after it appears to 'forget' all the remote openers. This is frustrating for my wife since it affects her the most. The other garage door opener has no issues like this and works fine. Any ideas to fix it short of replacing the whole opener?