Tongue jack problem

I have a 2011 Flying Cloud 30 with a front jack problem. Recently the power jack on the tongue has malfunctioned. When I push the toggle switch up to raise the trailer, it doesn't work sometimes. No problem when the toggle is pushed down to lower the trailer. The motor doesn't labor, it just seems dead. At other times it may work fine for a while, then, if I stop for a moment, it won't work and I am forced to crank it by hand. Any ideas out the as to what the problem is? Someone has suggested a grounding problem, but it seems like it would not work in either direction if that were the case. My guess is a bad toggle switch, but I don't know how to test it.