Good day, I'm having the same issues. I thought it was my Motorola g7 power causing extreme slowness - <5mbps DL speed on the bt smart hub 2. But we went away and saw I was able to get normal WiFi speeds on the router on holiday. So it must be the router. Sounds very similar to this post. Please could you assist BT? Might be the smart hub 2 as well?
THis started happening in June this year 2021. The hub was fine until then
Let me know what info you require?
welcome to the BT community forum where customers help customers and only BT employees are the forum mods
in order for the forum members to help please can you post the stats from your router (if hub enter 192.168.1.254 in your browser then advanced settings then technical log information .
Have you tried the quiet line test? - dial 17070 option 2 - should hear nothing - best done with a corded phone. if cordless phone you may hear a 'dull hum' which is normal
enter your phone number and post results remember to delete number https://www.broadbandchecker.btwholesale.com/#/ADSL
Someone may then be able to offer help/assistance/suggestions to your problem