Windows was updated yesterday 16.04.2021 and until that the Wi-Fi was usable in both RF frequencies.
I used a Wi-Fi Analyzer to identify the frequencies that were sensed.
Wi-Fi SSIDs broadcasting in 5GHz were only sensed when 802.11a/g was selected in the preference in the driver settings. For the rest of the preferences showed only the SSIDs that were broadcasting in 2.4GHz frequencies. Both Wi-Fi frequencies were not sensed simultaneously. The SSIDs on preferred frequency band were only connected when the 802.11 standards were manually selected in the driver settings.
This can't be practical as it should auto-sense Wi-Fi signals on both frequencies at the same time and to connect to the preferred SSID or the SSID with a strong RSSI.
Any solutions for this?
There is more information needed to be able to assist you with this. Is this a desktop PC or laptop? If a laptop, what model is it? If desktop, did you custom build the PC, or is premade? And also it will be useful to know what type of router or access point you are connecting to. And as an added piece of information, how you are analyzing the wireless information.
The easiest way to get detailed information about your hardware and OS is to use the Intel System Support Utility. The SSU does not collect sensitive information about your account(s) or passwords, only OS and hardware info. The link to the SSU is here: https://downloadcenter.intel.com/download/25293/Intel-System-Support-Utility-for-Windows-
Just download and run the utility. Click Scan, then Next, and Save. After you save the results, please reply and include the saved file as an attachment.