Hello everyone. I have a john deere 928e snowblower, i.d number lm0928e003421. Sometimes while going forward for no reason it stops. I have adjusted the drive cable, I replaced the spring that tensions the drive belt to a stronger one (per j.d recommendations) I have also cleaned and sand papered the friction disk and plate numerous times all of these things did very little to remedy my problem. When it does work the drive is very strong and the problem is very random. While its acting up I shake/shimmy the machine with the handle depressed and eventually it goes again, strong as ever. Any advice or help would be appreciated greatly.