The ramp on my enclosed trailer has started to act up after 5 years of flawless service. It doesn't want to come all the way down (stops maybe 4" - 6" from the ground) without stepping on it, and will pop back up off the ground when you step off again. It also will not close without some serious muscle effort. It's the style with the overhead coil spring like a garage door has, and cables coming down on each side. The first part of the problem seems like the spring is too tight, but the second part kind of indicates it's too loose(?). Maybe a hinge problem? Any thoughts?