Verify 5Ghz is a freeware, portable app to verify if 5Ghz your networking device supports 5GHz.

Double-click on Verify 5GHz version 1.exe, and you will know right away if 5GHz is supported.

If 5GHz is not supported, a link will be provided to 5GHz Wi-Fi Not Showing up in Windows.

How to Change Preferred Band (2.4 GHz or 5 GHz) for Wireless Network Adapters might also be of further assistance.

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How to Improve Your Wireless Network Performance
How to Fix Slow Internet on Windows 10
How-To Flush the Windows DNS Cache
How to Reset Network Settings in Windows 10

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