Judder. A4 sportline automatic

[Suze]

Hi Guys......I laid up my Audi A4 sportline automatic over Xmas for 5 weeks. Before this it was driving fine. 

Day before yesterday I went out in it ...was okay for a mile or so but then it started  to be like I was driving over a washboard. After about 15 miles it cleared and was fine. 

Yesterday was fine to start with but 40 miles from home it all started again...this time worse and I didn’t think it would make it home....hoped to get it straight into my local garage.  However, again it cleared up and was okay when I got home so didn’t bother with the garage as there was now nothing to show him. 

Any suggestions.......car was serviced about 400 miles ago

Tia