Im doug, new to this forum and new to driving a BMW. I have a 91 325i. i also had the 3 beeps at random it drove me nuts cause i never could figure out what was going on but it dont do it anymore. i wouldnt worry about it i think its just a glitch or something. i dont have and warning lights on no check engine all fluids filled. and also be prepaired to change the driveshaft posibly i had the same problem with mine and i changed the center bairing and i also had a bad u joint that they say is not changeable so i had to get a new one but you can get a used one off of ebay for about 150 and the center beairing is only about 20.