I'm operating a 2021 HST L4060. It runs great in forward gears, but in reverse it creeps along, maybe 5% of the forward speed, regardless of which gear I'm in. It seems it's been getting progressively worse. Just crossed 50 hours. I just put the snowblower on and it's almost unusable due to its speed; it also cut power a couple times while trying to operate it. What might be going on?