Hey guys. I have had my 80# 24v Ultrex for a year now and it's been amazing. The past few times I've been out I've noticed my motor not working as hard. When I ramp it up to 10 I can hear the motor rev up really high like it should for about a second then slows down to a different speed (maybe 7-ish speed) - even right off the trailer with the batteries just fully charged. It just seems slower than it use to be overall. New batteries were bought in May. Thoughts?