I have the digi sync on my full wall slide. This has happened to me when the 2 motors got out of sync. Is the LED on the control panel flashing??? If it is you can look up the code.
But this is what I did when mine gets out of sync.
Run the slid all the way in... then if you look between the in and out buttons there is a little hole. Use something small and depress the switch that is in the hole.. hold it down till the light starts flashing. The system is now in manual mode and you can retract each end of the slide manually. I retract the front and then the rear.. to make sure they are both in all the way.. then press the recessed button again until the LED stops flashing. This always gets mine back in sync.