I recently had the transmission replaced on my little D105. Shortlly after getting it back from the shop I noticed it had trouble going up small inclines. It would slow down on the incline but then resume normal speed when it got back on level ground. Today I noticed the same issue followed by a complete stop on level ground. Now it will barely move once it has come to a stop. Applying pressure on the pedal will only get it to move a few inches. After a few cycles of pressing the pedal and letting off it will eventually start moving normally but only in a forward direction. As soon as I turn the wheel it will slow down and come to a stop. After ten minutes of this I decided to give it a rest and drove it (verly slowly) onto the pavement only for it to start operating normally again but as soon as I got it back on the grass I experienced the same problem. Belts look normal and I can't see any objects blocking the gears. I have only used the machine a handful of times since I had the transmission replaced in July. Any ideas? Thanks!