Hi martinsands,
Thanks for posting and welcome to our community 🙂
Sorry to hear there's an issue with the hub, can you let me know if you've tried the below first-
Turn the power switch off on the back of the Hub.
Ensure the Hub is upright, in a well-ventilated location and out of direct sunlight, if possible.
Switch the hub back on at the power. The Hub should now operate normally.
Alex_Rm