I have a 2015 Outback with electric lift hatchback. Last summer I had the lift mechanism replaced because it was clicking - it was replaced under warranty. Today I heard a humming noise when it was in the garage - it seemed to come from the drivers side rear panel - where i assume the lift mechanism is located. I raised and lowered the tailgate, thinking that is was not closed properly. This also happened about a month ago and all I did was raise and lower the tailgate and noise stopped immediately. Not this time. However, I went out the garage again - about 20 minutes later and the noise stopped. My concern is having the battery run down. Has anyone else had this problem? Thanks.