Logitech C920 webcam flickering on XPS13

The picture starts OK when the laptop is turned on but after a few minutes starts to break up, see video https://youtu.be/D-UC1FWHsWQ

I've tried

Disabling USB Selective Suspend in Power and Settings app
Disabling "Allow the computer to turn off this device to save power" for all HID devices and USB controllers in Device Manager.
Updating the Logitech drivers
Swapping from the Logitech driver "HD Pro webcam C920" to generic Microsoft drivers "USB Video device"

Nothing works.

The C920 works well on a different Windows 10 laptop. The inbuilt webcam works.

Has anyone seen this and does anyone have a fix?

many thanks

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