Arris G34 - Internet connectivity issues

All,

I bought in December 2023 a new Arris G34 for my Xfinity 800Mbps service ( I replaced my SBG6580 after 12 years of service).

A couple of issues:

    1. After I placed in production the G34, I checked the Software Version.It was Firmware Version:01.05.020.04.01.NCS. But after a few weeks, I noticed that my G34 is running “Firmware Version:01.04.028.01.01.NCS” . Is it normal for xFinity to downgrade the G34?
   2. I’m running Firefox 126.0 but I’m still getting the message on the G34 UI console “Warning: Unsupported Browser” -  the version of Mozilla Firefox you are using is unsupported. Your Gateway's web interface has been tested to work with the minimum version: 63.0.3.
    3.For the past week, I have Internet connectivity issues ( 40% loss in Teams calls, my VPN client is keep disconnecting, the Verizon LTE Extender direct connected to the G34 LAN port can’t build the IPSEC tunnel , etc). In those moments, the G34 direct WEB UI access ( 192.168.0.1) can’t load  completely and I can’t login to the modem to check the stats. The solution is to reboot the modem. After that, for 48h, everything is working perfectly. Then, the issue is reappearing.

  Do I have a bad Arris G34 and I need to RMA or this is a problem that xFinity can help fixing?

Thank you