Car won't start - short in trunk?
 

I have a 2002 Mazda 626 which I recently bought from a major Mazda dealer. I'm having strange issues: the car often won't start, sometimes 3 times in a day - it won't do anything, all of the lights and radio are dead. The only thing that works is to open and close the drivers side door and/or the trunk several times until the lights come back on. There's obviously a short or bad wire somewhere in either the trunk or doors. My car has also stalled out at a busy intersection and I had to open and close the door...
Does this model have some sort of shut-off switch that if the car thinks the trunk is open is will stall?
Should my dealer be responsible for fixing this defect? I've only had the car one month...If so, how do I proceed?

Thank you for your feedback!
Terri