Hi there markpaulsm, I've had one of your dual units for a year or so now. Do you ever do firmware updates? This is the camera I have.
SYS VSYS M2F 3.0'' LCD Motorcycle DVR WiFi FHD Dual 1080P Front & Rear View Waterproof Motorcycle Camera Dash Cam Black Lens Box
Regards
Phil B
SYS VSYS M2F 3.0'' LCD Motorcycle DVR WiFi FHD Dual 1080P Front & Rear View Waterproof Motorcycle Camera Dash Cam Black Lens Box
Regards
Phil B

I might just suggest although I am sure you have already made sure all the connectors are well pushed in, as they are quite hard to push to the end.