dsg issue

06 jetta brm dsg 283k miles, during trip from Beaufort SC to Fort Worth Tx trans would not shift into 6th in drive mode flip into manual mode up and down no prob very crisp and sure, after park it shifts perfectly. I plugged in vcds and no codes check temp running at 85c after 250 or so miles. Curious if anybody has had this happen. Also as side note the trans was changed out with upgrade at 80k, last service was about 10k ago.

Check your grounds and the plug into the trans for a good connection is where you can start.