Please Help!!! Car keeps dying.
I bought my 2009 328i just about a year ago. Everything was fine until about 3-4 months ago when I noticed the orange battery sign showing up on the dash after about 3-5 minutes of turning off the ignition, but still leaving the key in. Also my clock and tripometer will reset every time I left the car overnight. Starting 3 weeks ago, the car started dying occasionally and I had to jump it, but it wasn't every time. So I take it to the mechanic and he says bad battery, he replaced the battery and checked the alternator, which was working fine he said.
the car died again a couple of times. Took it back to the shop, replaced the battery again (warranty) and car died again a few days after. Today I noticed all dashboard lights turned off while I was driving the car, parked the car for 15 minutes, came back and it's dead again.
At this point I think something is draining the battery. My question is where do I start? Can I check for anything myself before I take it to the shop and start paying $$$?
Any help is greatly appreciated.
ps. Warranty is already expired.