My Jetta's transmission down shifts very hard comming to a stop. on 2008 Volkswagen Jetta

Most transmission shops do not want to touch this car. It seems like it is low on fluid. I do not see any visible leaks and of course you can't check it. It is more prevelent in traffic where it is shifting alot. One transmission shop told me it might be a sensor.

Asked by for the 2008 Volkswagen Jetta
oss in need of service? see aamco for free diag and est then shop prices