About every day or 2, the DHCP server on my TP-link C3200 would stop issuing IP addresses. The router did not log any connection requests during the time when I couldn't connect to the router. Restarting the router fixes it but I run a few servers on my desktop and I can't have it needing to go offline every day or 2.
The last issued IP was 192.168.1.114, everything below was taken, lease time was set for 1 day and there were 86 open IPs available on the DHCP server.
(Note: Everything else still works, the devices that are connected stay connected until the lease expires, they just can't reconnect and new devices can't connect until I restart the router).