@Solla-topee Having provided the information requested, Yurik from support provided a new release of the firmware for the H200 Hub, which I download and I can confirm that it resolved the problem....

@RayM56 I can update my own query above. i have taken the Micro-SD card out of the Hub and viewed the files on my PC. All the expected recordings are present. I have put the card back in the Hub and...

***** Update ***** I have left my original post below intact, but provided amended info in post 2 below, please also read that. ***** Update****** My C420 is no longer recording on the micro-SD card...