I have been having problems with both connectivity loss and downloading files from a number of sites, on 3 different laptops in the house. Most recently, I have been trying to download and install the .Net framework from the Microsoft site but the download fails repeatedly.

Other laptops in the house frequently lose their internet connectivity, even though the wireless connection to the router is up and the router itself shows itself as connected to the internet.

BT telephone support advised that it was likely due to a problem with my laptop, and that I probably also had too many devices connected to the router (2 laptops and 3 phones in this case), but clearly that wasn't terribly well informed feedback!

Any ideas if there's anything that can be done from this end to resolve it? I have tried power cycling as well as a full reset of the router, but the problems persist (and have done for a couple of weeks).

I have the BT Infinity service, and an OOKLA speed test indicates download speeds of 30Mbps, which looks fine. The router is a Home Hub3 - Type B.

First thing to do is eliminate WiFi as the cause. Even though it may register as connected there is a possibility that interference is causing disruption to the WiFi. So connect via an ethernet cable and turn off the WiFi on the laptop.

Test with the cable and see if you still get disconnects or similar issues. That should help narrow down whether it is the line or the WiFi causing the problem.

One other thing to try is to dial 17070 on the phone which connects to a BT test system. One of the options is a silent line test, which as the name suggests makes the line go quiet. That will let you listen for any crackles or noise on the line that might be causing issues with the Infinity signal. If you can hear crackles and noise over the dial tone even before dialling this test number then that could be the cause.