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We had the same problem and found it to be the ultrasonic eye. Replaced it and it fixed the problem.
Ours was going too far away from the back of the vehicle.
Another thing you can do with wals is print out car wash "codes" that are good for whichever wash you choose. These codes can be sold to large groups as employee gifts. Codes can be used to do fundraiser's. And codes can be used as a rewash if a customer has a problem a you aren't around you...