Question Laptop can't connect to many websites (ERR_SSL_BAD_RECORD_MAC_ALERT) ?

[InsanityCrescendo]

I'm having a pretty weird problem. At some point and without having done anything different, my laptop just can't connect to certain websites (many websites, not just 3 or 4). When I try to access those sites I get the following errors:

https://imgur.com/a/krt8fam

Firefox: Secure Connection Failed (no error code)
Opera: ERR_SSL_BAD_RECORD_MAC_ALERT
Chrome: ERR_SSL_BAD_RECORD_MAC_ALERT
Edge: ERR_SSL_BAD_RECORD_MAC_ALERT


Some info:
- The problem only happens when I am on Wi-Fi (on ethernet I can connect everywhere fine).
- The problem only happens when using my home Wi-Fi. I've connected to many other Wi-Fi's and everything works fine.
- Windows 11, Lenovo.
- Network adapter: Qualcomm Atheros Wireless Network Adapter.
- I'm not using an extender or signal booster.

Things I've tried:
- Removing the laptop from the router manually (DIDN'T WORK)
- Restarting the router (DIDN'T WORK)
- Changing router (DIDN'T WORK)
- Several OS and browser settings (DIDN'T WORK)
- Uninstalled/Reinstalled network adapter drivers (DIDN'T WORK)

- Connecting via an external antenna (WORKED)
- Connecting via ethernet cable (WORKED)
- Connecting in other WiFi networks (WORKED)
- Connecting via VPN (WORKED)

So far I wasn't able to find any similarities of pattern between the several sites that I can't connect to. The only commonality is that I can't seem to connect to a good majority of greek sites.

Some of the sites that I can't connect to:

Home - Encyclopaedia Metallum: The Metal Archives

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[Fix_that_Glitch]

Do you have any pending Windows updates? Are you using any kind of app to enhance Wi-Fi connection? Using a Antivirus app? When using home Wi-Fi is set up as a private network or public network? When you use other WIFI same question.

 

[InsanityCrescendo]

Do you have any pending Windows updates? Are you using any kind of app to enhance Wi-Fi connection? Using a Antivirus app? When using home Wi-Fi is set up as a private network or public network? When you use other WIFI same question.

- No pending windows updates.
- No app to enhance Wi-Fi.
- Of course I have AV but I've tried disabling it and nothing. Also, it's worth mentioning that there are many other devices (pc, laptop, android box) on the same network with no problems.
- Network is set to private. Again though, all the other devices have no problem.
- Other Wi-Fis that I've connected to I don't recall what were they set to, some public some private I think

 

[InsanityCrescendo]

I finally solved it. For some reason my router has changed its settings to broadcast on both 2.4GHz and 5GHz. I changed it back to 2.4GHz only and now laptop connects fine to the wifi