Thanks for the information, Mark.
[Topic moved here and made 'sticky'.]
There's also an article on Tom's Hardware about it here:
https://www.tomshardware.com/uk/news/am ... ng-issues#
"AMD's fTPM issues impact both Windows 10 and Windows 11 Ryzen systems, with the typical side effect being random stuttering and lagging that lasts one to two seconds. These periods occur multiple times per day during all manner of workloads, including gaming. They manifest as jerky performance on the screen and interrupted and garbled audio ..."