I seem to get more random (two beeps) occurrences when starting the engine with parking mode recording. I can't see the camera screen as its behind rear view mirror, except for the flashing record and the car symbol at the top. So if the beep is accompanied with a screen notification, I'll never see it. At first I thought it was notification of an event in parking mode. Previously the memory card had created an extra "RO" folder, which held lots of "P" files. But today's two beeps, happened twice, but with no extra folder created on the card. The card had just a nice mixture of normal and P recorded files as I'd expect.
Today, I did notice the three files for the same time stamp present, (as described on 11th May above). Which made me think maybe the beeps and the third file are connected to other issues on the forum.
I did read someone mentioning that they couldn't get the front camera to play back full length file, but the rear played fine. If I watch the smaller sized front file, which is the third file on same time stamp, it only plays for about a second. Dashcam viewer continues to play the full rear file, whilst giving a blanc screen for the front after that smaller file ends. Maybe thats what they've experienced by selecting the smaller front (3rd) file instead of the first front file? Just a thought.