"Judders and freezes" sounds more dramatic than what I had. In my case
the image would just blip briefly every second or two while my head was
moving. Out of interest, what motherboard do you have? Mine is an MSI
B450-A Pro Max, BIOS 7B86vM7.
Mine stutters whenever I'm connected to a USB 3.1 Gen 2 port, but is
fine in Gen 1. You may have to check your motherboard manual to find out
which ports are which. There's a post on Reddit with further info,
including a suggested add-in card if none...