Earlier this year I did a flight to Cape Verde and on the return, it was the first time I experienced the vibration. Let me tell you that having your airplane vibrating worse than a farm tractor, in Africa, over the ocean at 4 in the morning, with 165 holiday goers is not the most comfortable place to be.
IFixPlanes: As I stated in the original post, that "Vibration Reporting Sheet" was filled in many times. When the airplane went to the hangar, they found problems with the THS. Now 6 months later the problem started again and the "Vibration Reporting Sheet" was again filled in many times (by myself and colleagues I talk to). ALL Ecam parameters are normal. And it only happens in climb between approx. FL180 and FL300