No start?

I recently drove my car from Oshkosh, WI to Winona, MN, which is about a 3.5-hour drive. Stopped to get fuel and potty stop. Came back out car wouldn't start. I turn the key to the on position and all the bells and whistles come up on the dash. When I turn the key to the start everything goes dark, and the car won't start. There is no clicking at all. In the past year I've had a problem starting the car. If I didn't lock the steering wheel when I shut the car off and lock the doors. When I came back out the car wouldn't start. Same thing happens. In the past I would lock the steering wheel and get out of the car and lock the doors, wait 12 minutes. Unlock the car and the vehicle starts. If I waited 10 minutes or less the vehicle wouldn't start. When the car wouldn't start in Winona, MN a tow truck was called, jump start didn't work, car was towed to a garage. After the car sat for 2.5 hours. The mechanic tried to start the car and it started. I picked the car back up. Drove the car back to Oshkosh, WI. Never shut the car off even when stopping. Parked the car after a 4-hour drive. Shut the engine off. I waited a minute, and the car wouldn't restart. I waited 4 hours and the car started. Any ideas?