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I have a TP-Link C3200 tri-band router and TP-Link Archer T9E 1900 PCIe adapter. The first day I was able to connect to the 5ghz bands but was only getting 350 Mbps while getting 405 Mbps on the 2.4ghz band. So I wanted to test the different channels in the 5ghz bands. Here are my results, but after testing and setting everything back to default (even uninstalled and reinstalled adapter) I can no longer connect to either 5ghz band. The following results were achieved by connecting to the 2.4 band, logging into router, changing the 5ghz channel, then changing channel on my adapter and connecting to the 5ghz network. I would repeat process each time by logging in on the unchanged 2.4 band.... change 5ghz channel, save, change channel on adapter, connect to the 5ghz network. I bought two adapters, one for each computer, and both adapters give the same numbers. Do I need to send back my router? Beamforming setting on adapter did not seem to make a difference. The listed channels below are the only channels that showed up on both the router and adapter.

The router is about 30 feet from computer with two walls between them. I would run cable but its not my house. I plan to use one of the T9E adapters in computer upstairs and one downstairs.
Hardware Version:Archer C3200 v1 00000000
Firmware Version:0.9.1 0.1 v004b.0 Build 160704 Rel.56586n

TP-Link Archer T9E
Driver: 6.30.223.228


5 ghz channel 36 (20 MHz) 117 Mbps
5 ghz channel 36 (40 MHz) Can't connect to network
5 ghz channel 40 (20 MHz) Can't connect to network
5 ghz channel 44 (20 MHz) 117 Mbps
5 ghz channel 44 (40 MHz) 240 Mbps
5 ghz channel 48 (20 MHz) 117 Mbps

5 ghz channel 149 (20 MHz) 175 Mbps
5 ghz channel 149 (40 MHz) 243 Mbps
5 ghz channel 149 (80 MHz) Can't connect to network
5 ghz channel 153 (20 MHz) 156 Mbps
5 ghz channel 157 (20 MHz) 130 Mbps
5 ghz channel 157 (40 MHz) Can't connect to network
5 ghz channel 161 (20 MHz) 175 Mbps