The network is secured with WPA2-PSK, AES instead of TKIP or WEP? Since TL-WR743ND works in client router mode, there is a root wireless router, right? What's the speed if you connect wireless...

When i choose wpa2 Personal and i set a new SSID i'm able to connect for a few hours but then i can't. Does it happen on all wireless clients? What kinds of them, phones, laptops or something else?...

I have had this router for two weeks and this is happened three times. To remedy I reboot the C2 Did you try to reboot your PCs? Test in this way for a period of time. Link two PCs by a network...

Read this article and you will find the answer. http://www.tp-link.com/en/article/?faqid=603

Very strange issue. Is it possible for you to test powerline adapters in different environment?

The modem is in compatibility list of MR3020? http://forum.tp-link.com/showthread.php?78007-Declaration-of-3G-4G-compatibility-issues&region=china