My 06 3520 is my first tractor so sometimes I am unsure whether things are "right". When I raise my 3 pt all the way up, with or without implement, it periodically lowers a very small amount and then goes back up. It makes a whining sound the whole time this happens. It occurs about once a minute, usually, the whole time the 3 pt is raised. Its as if it is bleeding down and then correcting. Is this a problem?