Sometimes cranking and run smoothly but sometimes doesn't crank and won't start.

What is your question?

Yesterday I went to the supermarket to buy food, about half an hour later I came back to get in the car to go home, but when I started the engine, the car didn't start. I tried to press acelerator at the same time when starting the car, it restarted and I went home with no problem. This morning before going to work, I wasn't sure if there was a problem with my car, so I ran around the neighborhood where I live. After running for about 10 minutes I've tried shutting down the engine for about five minutes then restarting it to see if there's any problem, totally fine, I turned off the engine. About thirty minutes later, I got in the car and started the engine to go to work, but the engine was completely unresponsive (no crank, no start, only a click in the starter relay is heard when the ignition is turned on). Good battery tested about 12.78 volts, headlights, air conditioning, radio, door clock, everything on the car is working fine except the engine start doesn't work.

How long has your 2007 Toyota Camry had this problem?

A few days