3.0 TDI from 2006, various problems

Hello have a few questions about the VW Phaeton. Got me a Phaeton bj.2006 v6 3.0 tdi. When buying already the electr. tailgate did not heist that it does not go up by itself or not too. If it is down and it tries to go it is at a point as if it is too difficult and it goes up again for safety reasons. Next problem is that after new installation of the windscreen it sounds at the start as if the servo pump does not have enough oil. Where I find myself What does the disc have to do with the servo??? Battery also empty car starts badly? Driving is topp but sounds so shy… don’t trust me to drive. Think are also piles of errors stored cruise control doesn’t work up and too much. Next problem navi doesn’t work. Sound sounds like all the heights are broken…. So many mistakes with such a super car. Are there perhaps some things solutions??? Before already Merry Christmas….