I have a Northman plow on my truck and I have been having problems with the plow actually working Sometimes it will work great. Sometimes when I hit the button on the controller it just gives me a rapid clicking sound. Sometimes it won't work at all. The angle on one side I have to push much harder than I used to have to. I went through and tightned all of the connetions and cleaned them all up and thought that I had it fixed, but today it did the same thing. Any ideas as to what it could be?