The SSID is running on the old Cisco WLC, as this is/ should of been a staged roll out the idea is that they will run side by side until all new APs have been installed. Is it likely that them running on two different solutions going to the exact same DC's for DHCP etc is a potential cause?    There is around 20% of the scope free so its not that, and like i mentioned it is really sporadic as and when it happens. For instance another machine within the same area wont be having this issue.  ... View more