I've got a Cisco Linksys X3500 ADSL2+ router which we have been using fine for a long while, until all of a sudden, the router stopped providing IP addresses after a certain amount of clients were connected to the network. The only way I can connect another client to the network is by removing another device. Manually setting an IP address for the new client does not work.
I haven't really changed any settings, apart from the WiFi configuration, but the issue is still present over Ethernet, and the problem is present on all computers, regardless of operating system.
I've tried modifying the IP address range, but to no avail. Strangely enough, however, the IP addresses provided by the dhcp server have huge differences between them (for example, the lowest IP ends in .9, whilst the next lowest ends in .26 – I don't think that's normal).
Any clues to how I can solve this? I'm on the latest firmware. Thanks in advance.