Transmission Sensor Problems of Volkswagen GLI

2006 jetta Gli with dsg gearbox, repeated transmission clunking (in automatic mode) when downshifting from 2nd to 1st, and harsh thunking in first gear from a stop engine revs up but car will not move for 1 to two seconds then thunk and car surges forward. Also thunking when shifting gear selector into reverse. Has occurred intermittently and often since oct 2007. Poses dangerous situation at intersections and in stop and go driving with potential intermittent loss of forward motion and sudden forward surging affecting the safe driveability of the vehicle couple of times narrowly missed running into the vehicle in front of me due to sudden lurching of the vehicle. Dealer replaced transmission temperature sensor in late 2008, but problem recurred and persisted afterwards. After few more incidents and visits to dealer through Jun 2009 was informed mechatronics unit was faulty and would be replaced. Waited 42 days with car left with dealer for new part to be delivered from factory " due to backlog' , in meantime car was recalled for transmission bolt replacement/inspection. Finally received "fixed" car with new mechatronics unit and problem recurred the same day three miles away from the dealership in stop and go traffic. Was told that transmission 'needed to re-learn my driving pattern" and to drive it around for a while to see if the issue would go away. Issue subsequently recurred repeatedly over a one week period especially when moving from a stop, with engine revving up then a sudden thunk and forward surge of vehicle. Returned vehicle to dealer last week still waiting for resolution.

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