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You might start with scanning the car with a VW scan tool; like VCDS by Ross Tech, post any codes you are getting. As noted valve body related issues are common (sticking solenoids; bad wiring harnesses, etc) but sometimes, a bad shifter selector assembly, failed wiring harness or one of the various sensors on the trans, can cause problems as well. Let us know, what your scan reveals, post any codes you find and we can go from there. Thanks.