I got my new HH6 with Infinity 1 on 9th Nov. I have had various speed variations until tonight when it dropped to 7Mbps download and the BT speedtest failed and asked to retest and failed again. The MyBT android app also failed due to echnical problems (it said). Following the BT link to chat to an assistant resulted eventually in phone call from a BT assistant (Batu) who eventualy said there wasn't a fault but I was within the 10 day period when the exchange configures the line for the guaranteed speed of 50Mbps and that was why the speed test didn't work (it had before the last couple of days).
I didn't know that that applied to FTTC connections, but I shall leave it until the 20th to have another go.
I have also had numerous occasions when my browser lost DNS and couldn't resolve URLs, but I didn't persue that issue .
My point is: maybe your broadband is being affected like mine with this stabalisation period. and If you want to avoid any possibility of phone charges (even though 0800 calls are free for most) then use chat to get them to phone you.
I have moved your post to a new thread.
Is there any noise on your phone calls? Dial 17070 and select option 2, there should be no noise between the announcements.
Please post the information from the smart hub, using this link.
Could you please post the results from the BT Wholesale speed checker, including the further diagnostics.
This is a list of your BT Smart Hub settings and current statistics.
BT Hub 6A Serial number:
Quiet line test is 'Quiet'. Just had my postbox email say it cannot send to my ISP SMTP server, change Wifi to 5Ghz and it connects, I presume this is the DNS fault I experience with my browser.