Hi! I have a 2018 Troy Bilt Bronco Auto with a 42" deck. Model# 13AK78BS011. While driving, mower will come to a stop, the pulleys will just sit and spin while the wheels dont spin. I let off the pedal, press it again. and it takes of driving again. It will do it randomly. It appears it does it more often at higher speeds and when the mower is "warmed up". The drive belt looks OK however, to me, it feels like its loose. Again, Im not quite sure how tight these are supposed to be when disengaged. Any ideas where to start?