Genie Intellicode Screwdrive problem

If I hit the wall button, garage door will open normally.

But, while it is raising, I cannot get any response when I hit wall button to stop / reverse it.

Door opens all the way. Then it is stuck open. If I unplug and re-plug it in, and hit wall switch, it will lower all the way. While lowering I can stop and reverse it by hitting the button, but it will return to fully open and be stuck open. If I lower door all the way, it will open all the way after that, but will be stuck open again, until I unplug and replug in.

Is this a problem that I can repair or do I need a new unit?

Thanks in advance, Dave

From what you have said, it seems that there is a need of little drive chain adjustment. Hence, I would recommend you to hire a professional garage door repairmen to get your garage door repaired.
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Garage Doors Repairs