T4U v3 (JP) Cannot use 5Ghz connections (Archer C6 Router)
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Hello all,
I have an issue with trying to connect my T4U adapter to any 5GHz connections. When I try to connect, I notice that my adapter will sometimes disconnect as if it has been unplugged, and then reappear as if it was plugged in again. Once I am connected to my 5GHz connection, I tend to get about 10 sections of good speed before even web browsing is almost impossible.
I have a TP-Link Archer C6 (also JP version) and I have also tried another D-Link router. Both have the same problem. I did read that the Onemesh on the A6 might be causing issues. Does anyone have any ideas? I've tried to find a solution on my own for weeks now.
I am using a 64 bit version of Windows 10.
@Evan1990 Good day,
Thank you for reporting the issue and sharing case solution 
This may be related to Smart Connect Feature on some router, Smart Connect will automatically select a 5Gh channel for router, while most Wi-Fi adapter supports Band1 5Ghz channel 36/40/44/48 . Users who met the same issue could also try to turn off Smart Connect off and try 36/40/44/48 channels on router and see if that helps:
Why cannot the adaptor detect the 5G Wi-Fi of my router?
https://www.tp-link.com/support/faq/2989/