Tranmission Problems

I have a 2011 Mercedes GLK 350 that I am having transmission problems.  Wanted to see if anyone had any idea if my transmission is in fact going bad.  Changed the fluid and filter and there were no metal shaving in there, seemed clean.  Symptoms were a slight hesitation.  Once fluid/filter changed car seemed to be doing good up until about 2 weeks ago.  The hesitation came back and my tach is bouncing and every now and then it feels like I am going over rumble strips which it looks like in all the discussions it maybe my torque converter going bad.  Does this mean I am going to need a complete transmission?  There are no check engine lights on.