I've had a look and it does seem that the area issue we were investigating has been resolved.
I've been through some checks here, and the hub looks to be within the specifications we would expect.
I can see it's been some time since the hub was last rebooted, if you can please do that first and let me know if there is any improvement.
Many thanks for your speedy reply.
I did a factory reset at the end of last week and have just rebooted, so hopefully all will now be well.