My new Toro rider's belt was slipping today in the rain. I almost ended up in the ditch one time. I would lose power in one or both wheels, but I don't think the blades were losing power. I can't remember if they're on the same belt. If I pushed the lever in reverse then back in forward, it would catch and be alright for a second then fade out again. My mechanic said he never heard of this problem since there is 110 lbs on the idler spring. Any suggestions? Thanks.