Can't reach Nora. Token change?

I have used Nora now for a few months without any issues. Was making some changes to Node-RED and saw the Nora nodes in a 'not connected' state. Nothing aparent so I had a look at the Nora site and as it turned out the token has changed.

I haven't done anything yet but wanted to ask whether it's normal for this token to change and if so what's the cycle time and how do I recover this?