Shifter question

[X5Andrew]

Hey guys have a 2001 x 3.0. Had a tranny replaced about 2 weeks ago and it's great. Only one small snag that I can't get my head around. The shifter works fine, but after a while, the light on the dash goes out, no P R N D and if i push the shifter forward a bit it shows D again and all is well. Sometimes it will be in drive and show S-4 on the dash. I did get under it and tried to adjust the shifter cable and not much change. There was a little play in the cable, so I am not sure if it is a Shifter I need or do I need to get the tranny reprogrammed? It was not reprogrammed during the install.

Thoughts ???