LThomet Welcome to the community!
The signal values of your modem are ok.
We have now done the following as a test:
- it has in the 2.4GHz WIFI still 2 other foreign WIFIs on channel 11
- Auto Channelmode was deactivated in the 2.4GHz WIFI
- Channel 1 was set in the 2.4GHz WIFI
- the 5GHz WIFI was activated
We also set your modem to IPv4. The changeover is completed in 30 minutes. After that restart your modem. If you have difficulties, perform a modem reset. Press the reset button on the back of the modem gently with a pointed object for at least 25 seconds.
Please report back afterwards with a feedback.