ralph

My 2005 model Audi A4 GCC specs, is kind of jittering and jerking while gear switches. It feels more terrible while downshifting as if somebody is hitting me from my back. Car has been recently serviced for 80000 kms and also changed the radiator last summer. I am second owner and havent done anything else so far in last 3 year. What could be causing such bolting jerks all of sudden? Does maintaining car outside other than Audi service center in Dubai is the cause of this issue?