Mike
As it says, please try the FAQ. I think this is a hangover from an old bug. https://wiki.batc.org.uk/Portsdown_4#FAQ
The solution there should work.
Dave
Portsdown 4 Update with LongMynd improvements
Re: Portsdown 4 Update with LongMynd improvements
Hi Andy,
73 Dave
My C920 is fed directly from a USB3 port on the Pi which in turn is fed into the GPIO from a 5.1V 5A PSU. The issue only occurs in the same modes as found by Stephane and confirmed by Dave so I can't imagine that power is the issue. However, the fact the camera shuts down may be a clue to identifying the problem, hence my post.I have the same problem on the Portsdown 4 until I realize that this was a matter of current getting to the camera. Once attached to an RPI safe powered hub with a good PSU the problem went away.
73 Dave
...are you sure I can't use a pair of 813's?... 

Re: Portsdown 4 Update with LongMynd improvements
It's interesting that it has always worked before. However I recall I did try the Jetson Nano test version. It is now working but has lost all my band settings, even restoring from /boot. Luckily I didn't have many settings to lose.G8GKQ wrote: ↑Mon Oct 26, 2020 11:43 pmMike
As it says, please try the FAQ. I think this is a hangover from an old bug. https://wiki.batc.org.uk/Portsdown_4#FAQ
The solution there should work.
Dave
Mike