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Is there any noise on your phone calls? Dial 17070 and select option 2, there should be no noise between the announcements.
Hope this information helps identify the problem.
I am unable to test the dial tone, as I don't have a landline phone.
You need a phone to avoid a possible charge and to keep the line clear of possible faults, and for emergency use.
If the phone line is noisy or has a high resistance connection, then that will affect your broadband and cause disconnections.
The lack of any current flowing through the wires due to the lack of a phone providing an occasional loop, causes oxidisation at any joints which causes the line resistance to increase. This does not show up on a normal line test.
With Private Circuits it is common practice to allow a small "DC Wetting" current to flow through the line to prevent this problem.
There are quite a few people like yourself that do not plug a house phone in to check dial tone every so often. This can cause issues with broadband. Also, if one wire has become disconnected (quite common), then that will cause no broadband, constant disconnections, or a very low speed.
The solution is to get hold of a cheap (less than £5) wired phone, and plug it into the phone socket to see if you get dial tone.
Then dial 17070 (free call) and select option 2, quiet line test, and see if there is any noise on the line.
I have bought a phone and done the quiet line test. There is no noise at all.
What would you suggest to do next?
See if its still dropping out, now that you have plugged a phone in, and provided electrical continuity.
Ring your phone from a mobile, and let it ring for about a minute before answering it. If there is any high resistance connection, then the high ringing voltage will tend to break that down.
I have done everything you have suggested, and left the phone plugged in, but the wired connection is still dropping:
Any idea what to try next?
According to the home hub stats, you have been connected for 16 hours.
If your are still being disconnected from the Internet, and the home hub is showing as connected, then it has to be an issue with your local network or computer.
Google Chrome is quite fussy about connections, and will sometimes time out very quickly if it cannot do a DNS lookup.
The message you are seeing implies that you are connected by Wifi, not direct Ethernet connection.
If you are using a direct connection, then turn wifi off, as that can cause conflicts.
To prove it, you could try a different web browser to see if you still lose the Internet connection.
The light on the hub is always blue, even when the internet drops.
I am definitely connected to the internet on via wired connection, with wifi turned off:
I have tested on a different browser (screenshot background below) and this is the same as when using Chrome. When diagnosing the problem it says the modem is experiencing connectivitely issues:
This can't be a problem with the computer because the wifi drops on iphones and a mac laptop at the same time as the wired connection to the computer.
Are there any other things I can try?
I really need to get to the bottom of this, so happy to continue to check any suggestions.