We have put together a short survey to capture your feedback in terms of what BT can do when you experience home Wi-Fi issues. We would appreciate it if you could take a couple of minutes to complete a short survey. Read more from here, Fix my home Wi-Fi
You appear to have a FTTP connection, is that correct?
If it is, there is not a lot forum members can do regarding your connection.
Is it happening with wired and wireless devices?
If it is only with wireless devices it could be that you have a wireless problem. Make sure that you turn off "smart setup" on the Homehub.
See link how to do that.
and that some devices have a problem with the Homehub dual band having the same SSid (name). You should try splitting them.
If none of that helps you need to contact the FTTP Team on 0800 587 4787 and report a fault.
Are you using the test socket with a filter to see if that helps your stability?
try quiet line test. Dial 17070 option 2 should be quiet and best with corded phone