This is going to happen every 8 hours…you need to refresh the page and it “reauthenticates”. I have the page permanently open in a tab and after 8 hours I have to refresh. They did this because of attack problems. It was initially every 30 minutes when I raised it with them,…so they moved the time to every 8 hours.
Nothing I can do apart from raise it as an issue again which I have…but even if they make it every 24 hours, you will still see it every day!
Not a huge issue and doing a web page refresh is just something it looks like we will just have to live with.