No Electric, Car will not start

cotojoe

I've had this car for 3 years with no problem, but now something strange is happening. Sometimes when I get in the car to start it I have no electric (no lights, nothing) and the car will not start. Then 10-15 minutes later the car will start, but all my radio presents are gone, dash lights are dim, and the clock stopped running from the time it would not start, but runs again when the car starts This happened twice in the past 2 days...

Last weekend I paid a repair shop $800 dollars the the major 90K service that included a tune up with new spark plugs and everything else... any connection??

Any ideas will help.... Thanks