My Automatic X5 Stalls....

[FeelGoodUnInc]

I'm up to 90,000 miles now and I've been having stalling issue of late. It's mostly when I'm turning, rarely when I'm driving in a straight path...but it is getting scary because today it stalled when I was exiting off a freeway (LAX/Century Blvd.) the exit has a lil bit of a curve to it, I was on the right lane and as I was turning the wheel. it stalled...so the wheel was locking into place and I had to force with both hands to steer my car back to the right side.....luckily for me there was no car on the left of me

If anyone knows what the problem may be please let me know.