car is slam shifting

What is your question?

engine light has been coming on and off. Took to repair shop, but the light was no longer on. They did say it was "slam shifting" Especially fro Reverse to drive. Not all of the time. and they also said when stopped on a hill, it is shimmying. My Volvo 2012 XC60 only has 66,000 miles.

What makes this problem better or worse?

nothing really

How long has your 2012 Volvo XC60 had this problem?

few weeks