garage door bounce

My sister's Garage door won't stay closed. It's an automatic. As it travels to near the bottom, it stops and returns to the upward position.It is not obstructed, the channels are clear and the wheels turn freely. I thought it might be a problem with the balance of the door, but it moves fairly...

Hey everyone, I just installed a new Genie Screw drive garage door opener. I adjusted the open and closing settings with no problem. When I open the door, no problem. When I go to close it, it gets about 1/2-3/4 of the way closed, the track looks like it bends upwards some, then pops and...