I had my E2500 with 2.4 and 5Ghz WiFis with different names working fine for months until yesterday when 5Ghz WiFi stopped working and I had to switch my PC back to 2.4ghz. When I go to the router page -> Status -> Wireless Networks the 5Ghz network shows an empty MAC address, Channel as N/A and Channel Width as N/A, while 2.4 has them properly filled. I've tried using different settings for the WiFi, but nothing worked. I also tried resetting the device and updating the firmware. How do I know that the 5Ghz interface is not defective and figure out the cause of the problem?
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