Cub Cadet LTX1040 - Surging kinda drives

I am sure this is beat to death so please don't beat me to hard! I have a 2013 Cub LTX-1040 13WX90AS010. I am curious if I am suffering from the shift linkage slipping. I can go forward and back but I will surge when I step on the pedal ( forward or backwards) sometimes I will not be able to move until I kind of rock it back and forth a little. There is a noise, that I tried to get on video but god forbid my IPhone work right lately. Belts and pulleys all seem to be good, when its up in the air the back wheels seem to lock up at times when trying to spin them. Maybe I answered my own question but I was hoping for some one might have more experience with these machines .

Ask what you need to and please like I said don't beat me to hard for being kind of inexperienced!