2003 automatic Audi A4 speedometer stops then jerks. Help?

What is your question?

My 2003 automatic Audi A4 speedometer stops working when I come to a stop (red light or stop sign). Then when I start driving again my car starts to jerk a few times then proceed to drive normally; however, my speedometer doesn't work and stays at zero, so I don't know how fast I'm going while driving unless I use my speedometer app on my phone. This is random and doesn't happen all the time, but it is becoming more frequent. What do I need to do to fix it? Can anyone help?

How long has your 2003 Audi A4 had this problem?

A few months