When riding in camera mode I notice sometimes the speed shows zero for a few seconds and there are a few occasions where it stayed at zero from being switched on.

I assumed the cable must be loose but upon inspection this was not the case and there is no damage. This has occured from the start even before being fitted to the bike but my custom made mounting means it is effectively in its own dashboard, protecting everything and reducing vibration much more than what other people will be doing just mounting it on the bar with the provided equipment.

As I would normally have AA active the phone will fallback to its own location and does not show the speed so you will not notice this happening. Since the new feature in 2.7.2 to enable the rear camera automatically when stopped it is apparent that this is happening far more often that I thought because it will randomly switch to the camera at 70mph and be logged on the video and metadata file.

Other than this causing it to be more apparent it does not appear to be getting worse so it seems unlikely to be a fault with the hardware. Or have an obvious cause as the sky is clear and mostly unobstructed either side of the road so I cannot see how it is loss of signal. Unless only a small number of satellites are being used but both my phone and watch do not show any issues under that same conditions.

I feel you could probably filter our these events as there is no way a bike could decelerate from 70 to 0 so quickly, and then accelerate back 70 just as quickly some seconds later.