Hi @Rumpole,
Greetings and welcome to the Roku Community.
Thanks for sharing this information with us, and we understand you're having network connection issues after the update. Have you tried connecting to an alternative network such as a mobile hotspot as start to see if you're able to maintain a connection?
Let us know what you find out, and we'll assist you further with this.
All the best,
Kash
Takashi O.
Roku Community Moderator