@shaaaaaake As a start:
For Community members to be able to help, information from these two sites, as screenshots:-
BT Broadband(obscuring your phone number) and BTW Performance Tester - Over a wired (ethernet) connection if at all possible, please report the 'ADDITIONAL DIAGNOSTICS', and sight of the broadband connection status from your Hub would be a good starting point.
For the Hub One -
Navigate from the Home Screen to Troubleshooting > Helpdesk
For the Hub Two -
Navigate from the Home Screen to Advanced Settings > Technical Log > Information
It may also be a good idea to report the results of a Quiet Line Test - dial 17070 option 2 from a (preferably corded) phone. After the confirmation of your phone number, there should be total silence apart from the regular 'Quiet Line Test' announcement. Any other noise - report a PHONE fault first.
If phone test is OK then take the front off your telephone master socket, you may need to remove two screws. In behind you will find the test socket. Plug a filter in here and connect that to your hub. If it’s still dropping out then report a fault at https://faults.plus.net.
John
