Can't get it to record

[Booti101]

Hi
I known I am doing something wrong, but I can't work out what.
I set the timer to auto record, but it appears to be completely hit and miss as to it starting or not. I have done at least eight sessions today ranging 2 to 12 laps, but only two sessions appear to have recorded.

Can you offer any advice please.

[Harry]

Have you mounted the phone in your windscreen? Which track are you driving?

Harry