BoughtAHeadache

My car is having all sorts of issues windscreen wipers getting stuck once I start to drive, Seatbelt sensors going awol, windows not working properly or getting stuck I’ve changed the regulators still having the same issue

New poster here, My 2006 bmw e53 x5 is having major electrical issues my windscreen wipers keep getting stuck or not running properly as soon as I start to drive I tried to have the battery changed but they advised me not to waste my money as the battery is only a year old I have no idea what it is going on. My seat belt sensor keep going off even with all passengers being buckled in any help would be greatly appreciated