I have a g35 2 door 2004 with about 93k miles on it. While I'm at a full stop, my electronics along with my engine will completely turn off. All lights and anything electrical aren't on which include the hazard lights most importantly. I can't crank engine or anything. After i remove my keys and wait a minute, the lights will come back on along with rest of electronics. At this point, i can start my car and drive off. I haven't had a issue with it dying while i'm in motion, but this has occurred three times today, and Pepboys could only suggest a busted Body control module after they failed to reproduce the event. Also, there is no check engine light on
I was wondering if anyone could point me in the right direction to fix this as i'm tight on money and i can't afford to pay costly repairs i may not need.

Update- Additional information
I've noticed that the car has been idling at a lower speed than usual. I would like to think that the electrical problem may be linked the RPM of the engine, but i'm not sure how.