Garage door opening by itself. Woke up bright early morning few days ago and found garage door open. Family and I got really scared. Thank God, Every night I check the door leading to the garage is locked. And today, door is opening and closing incessantly. Had to pull the plug off and disconnect the backup battery to get it to stop. My son is in wheelchair and I need to use the garage door on a daily basis. Garage door opener was installed only a year and half ago. Will Chamberlain cover this under warranty ?. I have called the garage door technician that installed it to come and take a look tomorrow.