The clutch adaptions can be reset in the ZF 6HP19 transmission, but can only be reset by a VW specific diagnostic tool like VCDS from around 2007MY (at least here in the UK) unless the TCM software is reflashed by a dealer. The reflash may have a related TPI which may require a different ATF. The adaptions can be reset on earlier vehicles using a ZF tool which is probably only available to ZF themselves.

I very much doubt that pressing the reset button will fix this issue you have though; the transmission will adapt to where it needs to be regardless of whether or not a reset has been carried out so maybe try NETech's procedure above. As per other suggestions above though, there is probably an issue that needs fixing.