@WildPyro I don’t know whether this is relevant to your setup but you may be interested in what I found re. ad-blocking.
See Focus window issue Norton 25.10 - #26 by user10572 and Focus window issue Norton 25.10 - #28 by user10572 .
The loss of focus issue is definitely much improved by v25.12.10659, but not resolved. Thank you for your post above - this lead me to look Process Monitor. I similarly have the UI process exiting and restarting. The cef_log.txt file in AppData\Roaming\Norton\Antivirus\log contains repeated entries of
Network service crashed, restarting service.
So it looks like the application isn’t cleanly handling not being able to access the URL.