2004 Beetle Automatic Trans acting up
 

I have a 2004 VW Beetle, Auto Transmission. Its been acting up has only 43,000 miles on it. When cold at times, it really jerks hard when shifting into 2nd and sometimes in 3rd. Any ideas of what could be going on here? It doesnt happen everytime but has happened a few times seems more often latley but when cold.

Thanks