Hmm, so just read the issue ‘Progam guide information in New Zealand (NZXMLTV)’ which didn’t stand out to me as being related as it specifically names New Zealand and should be renamed. I live in Australia.
https://forums.plex.tv/t/progam-guide-information-in-new-zealand-nzxmltv/227249
So it would seem this is related to DST which also fits into the time frame I first observed this issue as well. Looks like this is a common ongoing issue.
I’ll re-add the DVR once the issue is resolved. Can’t risk burning out my server or setting my house on fire until then.