Do you have marked "Connect Automatically" in WAN settings?

got the W8961ND few days back and i have this problem cant login to 192.168.1.1 This is problem with RAM memory in the router. Your problem can fix UPnP feature disable. TP-Link support knows this...

No problem for me. I wrote in my signature it's my hobby only :) Greetings from Poland!

If you have warranty time please replace router in the shop

I suppose that router is broken. Can you see hard reset 30/30/30 - http://www.jimasek.elektroda.eu/index.php/poradniki/66-hard-reset-30-30-30

ftp://tplink-forum.pl/DD-WRT/webrevert/ - you can catch it here on my ftp server.