Another very real possibility is cables that are out of adjustment, either because the adjustment blocks on top, by the motor/gearbox/chain and sprocket area, have loosened up and have slack in them.....or, the cables have stretched enough over time to be out of adjustment. The BAL slide system operates on a "give and take" method and if they become out of adjustment for the reasons mentioned above, you can very easily get the same results as you are experiencing. If you do not have the maint adjustment instructions, you should download that from their site and familiarize yourself with exactly how this system works. Hope this helps. Here is the link to that instruction manual......
https://norcoind.com/bal/downloads/a...ice-manual.pdf