Hobbywing v2.1 esc issues

[tonydevon]

Hi.
Anyone shed any light on this.
Has happened 3 times now.

Start of the final. Car sat on grid. It was driven couple of laps then placed in position.

Buzzer goes
..
Nothing.
Today 3 cars piled into me. Punted off the track. All over before it began.
It seems like if i leave car sat there then it goes to sleep??