Unfortunately whatever has triggered that can only be found from your end.
Ctrl+Shift+J opens the console on Edge. If you do that, you should see the error message somewhere. If you post that here, I'll be able to take a look, but it may be just one of those one-offs (or few-offs) which self resolves.
Not sure if this helps Bozza. Sorry you are having to spend time on these problems. I am sure you have better things to do on a lovely sunny morning.