2003 chevy malibu won't crank.. Drove around about 30 minutes, came home got ready to leave 15 min later wouldn't crank. All lights and radio on. Simply quiet. Some reason passenger rear door was open, closed it. closed driver door turned key...car started. Drove around 45 mins to an hour stopped at five or six places, got in car started. got gas drove about 26 miles parked car sit for about 30 min left, engine started. Went about 1/2 mile came back turned off car. Waited about 10 mins. tried to start again, no sound. Slammed all doors..don't know why...turned key, car started. Drove 2 miles to food spot parked, turned off car, tried to turn right back on, wouldn't start, no sound nothing...hasn't started since... HELP
( UPDATE)
was able to start with screwdriver to starter tap...theft system light has been on a year, wouldnt go off. Could this have finally blocked charge to the starter? :(

Yep. Your lazy anti-theft sounds like it finally woke up. You might have worn or maladjusted door switches. I'd check the driver's door first since it's the one that gets the most use. You should be able to find the switch inside the door on the actual latch.

When the "theft system light" is solidly ON with the ignition ON, it means there's something wrong with the theft deterrent system and thus the BCM set one or more B-series codes. It sounds like the theft deterrent system has been in the fail-safe mode, allowing the vehicle to be started and run. DTCs (needs Tech 2 or equivalent) would be super nice to have in troubleshooting. If I had to take a wild guess, I'd pick the ignition switch.