i have a 04 beetle convertable i bought brand new and loved loved loved it in the beginging...now i only have 51000 miles on it and i am having a hell of a time. i am on my fifth battery and now the car wont hold a charge. alter and starter both tested fine and all the fuses have been checked and changed. i have already replaced 3 of the 4 window motors and just dont know what to do with it now. it can loose all power as often as every 3 days. am i missing something here?