Every 6 months to a year the car won't start monetarily.

What is your question?

The car won't start but the panel lights turn on when the key is turned to start. If I fuss with it ( move it out of park to neutral and back again or turn the key off and then on again).a little then wait for a short period of time, 15 to 20 minutes the car then starts and is fine for another extended period of time, 6 months to a year. There have been several occurrences of this annoying failure. Perhaps 6 to 8 occurrences. The service shop has set the car up to diagnose the problem but it never fails when they have the car. They are reluctant to change anything as they don't what is failing. Perhaps it is the starter is on a dead spot??