A large number of our customers have routers supplied by BT when they order business broadband. When the routers are installed, we configure the firewall to allow our EPOS system to communicate between shops.
About every two weeks, customers call us complaining that the system is not communicating. After connecting to there computer we find that the firewall has been reset to Maximum Protection and the firewall rules have been deleted.
What could be causing this problem? Is this caused by automatic firmware updates?