Sounds like the mecatronic unit is over heating , its known problem with DSG's. There have been many threads on this issue, do a search on DSG problems. Its called loss of drive , ive had it on my ed30 when pulling out of JCT, yes its bit scary when you see a car coming at you with no drive!! Hope you get it sorted soon
My Ed30 only did it every blue moon, I bought the car from new did 12k miles and it started doing it from about 5k miles. I did make the service manger aware of it and he offered to replace the unit (big Job) or new gear box, but I just lived with it TBH then sold the car back to them and got 18k aginst a new Mk6 GTD. In the states VW issued a re -call on some DSG box's!! Its in the forum somwhere GTI james sufferd the same problems!!
My gear changes are jerky when cold when using manual, also when i put it into reverse i have to wait ages for reverse to engage, if i dont and touch the throttle it clonks into gear. Sometimes when pulling out of junction it takes ages to fully engage clutch, almost liek clutch slip.... My VW warranty has just ran out too Should i extened and claim??