My husqvarna tractor quit moving in ether direction the other day. It's done this once before and then started moving again like nothing ever happened. I didn't do anything that I know of mechanically to get moving again. I undone some switches & didn't see anything wrong so I put them back & nothing happened, I pumped the forward peddle a few times & it took off like nothing was ever wrong with it. It worked for about two mowings (3 hrs.) and quit again. I've done the same thing but to no avail any advise would be greatly appreciated.