This happens to me on my new Sony TV three or four times per week. Turning the TV off and on has no effect. The Wi-Fi is fine for all other devices in the house. If I wait a few hours it works again.
Hi @BobR1! Welcome to community.
Thanks for posting your experience, sorry to hear this is happening. I've gone ahead and passed this along to our engineering team for review.
I would also recommend reaching out to Sony Support for further troubleshooting steps specific to your TV.