I met the same issue like yours and I have to restart the AP to make it work again each time. :( Emailed to TP-LINK support and they gave me some suggestion. Perhaps you may have a try. 1. Check the...

try to change another wireless channel on your wireless router.

As I known, it can only support 1~13.

If you want to post your problem to TP-LINK, you had better forward it to support@tp-link.com.

It seems that can't support UPnP but you had better contact TP-LINK support to confirm the specific information. :)

Try to change wireless channel on TL-WR1043ND. Your current firmware is already the newest one we can get from TP Website.