When I turn off my car, all power is lost - door locks won't work -
lose radio station settings, clock setting etc, and the car won't
restart. It will restart sometimes after a few seconds, and sometimes
after a few minutes. This doesn't happen every time but maybe once
every couple of dozen times. I have taken it to my mechanic (not
dealer) who can not identify the problem. Problem coincides roughly
with installation of a new battery. Any ideas?