vandunga3

the car's air suspension feels normal about 30 mins of driving but sometimes its only 15 or 10 mins and then it feels bumpy. For the last time when i was driving and stopped at red light, the car automatically leveling itseft with no reason ( i put it on comfort mode all the time ). When the suspension is not normal i can hear the noise coming from the sunroof as the car is twisted but if the suspension working normal then the noise disappear but when it is normal the car performs normal ( gearbox changes smooth, remote range is about 100m ) but when its acting weird the gearbox change not normal ( not smooth ), remote range is like very bad ( cant even unlock or lock the car with 20m range), sound system sound worse than when the car is normal ( lack of bass ) . the car's alternator and battery have been replaced 1 month ago ( alternator is brand new from audi and i bought the battery in supercheap ) but when i measure the voltage of the alternator yesterday it was 13.8v on idle with all the heater, radio... on. i researched on the internet and found out that the idle voltage must be at least 14.3volt ( rated voltage ) . Could u guys please help me find out the problem? Thanks