Yes, you can set all the SSIDs to be with the same name. But you won't benefit anything from that. Moreover if you have any smart home devices that could cause connectivity issues. On the other hand...

@Mrd7788 Hard reset (Method 1) the device.Default login after reset should be admin/admin (router IP address:192.168.0.1) Then re-configure the device and set new passwords for the Web GUI and...

@oulymouly , Have you tried the beta FW from this thread ? This has been released during last Christmas, targeting wireless stability, while still waiting for the next stable FW.

@duzy77 Follow this link, scrolling down there's a table with comparison of the Basic (Free) and Pro HomeShield features. Under the table there's a Note: *Get started with a one month free trail of...

In your first post you mentioned that the issue has started after a FW upgrade. So I can't say definitely that's a HW issue.

What's the modem type ? Are you using A9's Internet port(blue port) or LAN port ? You can test with another cable or different modem port.