While this did fix my KDE Connect error, I am now getting a lot of 'System UI is not responding' prompts.
I am unable to reproduce, it just happens after a while when opening various apps.
When tapping 'Show details' nothing is happening (that's how I got the KDE Connect logs last time around), when tapping 'close app' the entire system is crashing to a black screen and I have to force a shutdown.
I also believe my battery is draining rapidly, Settings seem to indicate KDE Connect is the culprit, but I am not sure if this is just paranoia. Will keep an eye on it.