I have had the archer C9 for almost a year with zero issues. I bought a netgear repeater last July and it was working perfectly on the 2.4ghz frequency, last week though the repeater would connect to the router, but not the internet. So I bought a TP link AC750 extender and set it up last night, and it connects to both 2.4 and 5.0, BUT just as before, the 2.4 frequency gets no internet but the 5.0 does. Is there something I am missing in the C9 that is suddenly not letting repeaters connect the 2.4 frequency to the internet? I can connect to the 2.4ghz fine directly to the router, just not through repeaters.