Samsung series 7 TV

I had my TV all setup fine but now its showing offline in ST and Alexa. But it is connected to the Internet, logged into ST account.
Stuck for ideas

I have exactly the same problem and no idea how to fix it. The TV is on, connected to the Internet. But it show offline in ST and when I ask Alexa to do something, it says the TV is not responding.

Likewise. Exact same issue. It’s been working fine for a year and now is no longer detected by Alexa or ST despite confirming it is connected to the home network / internet.