Yet another problem

[Curious Joel]

My 330xi has been developing lots of small problems... I thought I'd post them here to see if anyone has ideas about what's causing them.
1) The rain sensor is messed up. Sometimes when it's raining hard the wipers won't go fast enough even in the most sensitive setting, and sometimes when it's barely sprinkling the wipers will flip out and start going full speed.. I think the full speed problem could be caused by smearing from the wiper blades, but the wipers are only about two months old. The rain sensor has become really irritating because I have to keep moving the switch, which kind of defeats the purpose of the rain sensor.. I just had the windshield replaced, so is it possible that somehow screwed up the programming?
2) When I'm getting off the highway and I use the brakes, the whole car shudders... I find it hard to believe that the rotors are warped... I just had the front pads and rotors replaced a few weeks ago! It's not like I ride the brakes, either. Is there anything else it could be?
3) Every once in a while, one of the headlights will go out.. It's usually the driver's side low beam, but sometimes the passenger's low beam goes out. It's always one at a time, and they always come back on if you restart the car.
4) Today I unlocked the car with the remote and only the driver's side door unlocked. The passenger doors wouldn't unlock even after I pressed the unlock button like 5 times. It also wouldn't unlock from the button inside, either.
I've found that my 3 has a lot of small problems... Little things keep breaking. I think it's impressive that I've had no mechanical problems on it (except the engine coils)... It's got just over 73,000 miles on it and it runs fine.. But little things keep breaking and it's driving me nuts!