@sa2000 - I actually followed this advice;
PlexTV Server can no longer see HDHomerun tuner?
On the thread from @JCHH - but thats because I am happy with linux. I think the main advice of downgrading (and then upgrading) would actually be a simple option.
Essentially, I deleted and then re-added. Prior to killing the processes, I couldn’t get to the option to delete the DVR.
I am still on 1.16.3.1402.
There was no upgrades to the wintv drivers.
Edited out ‘quickest’ for ‘simple’