I've seem too have resolved the problem, on my end at least, after reading JonFo's last comment. My LAN uses the 192.168.2.* range of IP addresses, and my router's DHCP server hands out IP addresses...

username99 wrote Was your ticket solved by TP-Link? No, I got an 'auto' reply which was telling me to go through all the regular motions, like resetting etc. I didn't feel like doing all that yet...

I just posted a ticket to TP-Link, since I'm having the exact same problem as described in this thread.