@Wayne-TP 

Thanks for the response. Both guys were definitely still within the frame / camera's view (With their backs to the camera, as they were leaving) when the recording stopped at 5 seconds. My expectation is that I should have seen them leave the scene completely with the 10 second buffer but it's not the case. They were walking towards the camera and made a quick U-Turn (all within 5 seconds). I can send you the clip via Personal Message for a review if you want.

I am pretty sure they left hastily as I have another Tapo TC82 pointed from the other angle / corner from the C420 but the TC82 didn't trigger / record anything as they came and left quick. Had they not spot the C420 and loiter I am sure that the TC82 would have caught them as well.

I am also not sure if this particular C420's entirely at fault as generally speaking it behaves the way I intended it to be, it is just that on this ocassion it's not done it and it so happens that I had people who I do not want coming around which triggered it (Hence video of interest). Usually it captures passing vehicles, foxes or cats which does not really bother me. I am sure every now and then I have seen this abruptly cut off behaviour with other clips in the past as well (And always, at night / when it's dark) but I never bothered as they were just passing vehicles.

Perhaps it's an issue with connectivity to the H200 hub at that particular point in time which causes the recording to be cut short? I'm not 100% sure how these cameras work.

  @Wayne-TP 

I confirm that I have received the email and I will follow up with them. Thanks.