Hi Tomas,
Thank you for the explanation of what has been happening and why it happens. I am a little surprised the IP's were getting blocked because they are all part of the same LAN as the router, it wasn't like the router was being accessed from a WAN location.
I am not sure all the IP's being blocked had tried to access the router by WEBUI/SSH but it might happen happened. There is only three members of staff in the company and I am the only person who knows anything about the router.
Hopefully firmware version 7.2 isn't too far away from being released.
Thanks for your help,
Steve