paulson

Can someone help, I have a bmw 520ISE 1997 and it stalls whilst driving, it does not give any indication,I wonder if you can help? I have a BMW 520 SE 1997 Dec made on R reg, done 161,000 miles, After driving some distance, it just cuts out, nothing before to warn you, just cuts out, then have to wait a few minutes, turn the ignition and it will start. Then all ok until next time. Does it once a week like that, always nearly the same place going home from work. Otherwise engine seems ok, no problems. Do you or anyone you might know what causes this? Any help would be much appreciated.