I have had EXACTLY the same problem since 23/12/24. Two new SmartHub routers later, BT are still in denial of the problem, although the are sending an engineer to look at it on Thursday.
Router gives the appearance or working perfectly. Blue light etc. After a factory reset all is fine for a couple of hours, then when going to any web page, "Hmmm. Cannot connect to this page," or "Hmmm, Connection interrupted."
Nothing remedies this problem except a SmartHub reboot (occasionally) or factory reset (for a couple of hours).
My laptop is connected directly to the SmartHub by Ethernet cable. My wife's is connected by wi-fi. Her laptop is doing exactly the same thing. When this happens, email stops. Alexa stutters and stops if I am listening to the radio. Digital Voice phone carries on working perfectly, as does heating, lights, and Ring doorbell. Wi-fi still show as active.
When I connect on either laptop via 4G mini-hub (only one bar on EE network!) or tethered to mobile 4G (O2, full signal) all works perfectly, albeit a lot slower than even the FTTC which is the only broadband available here.
I cannot enter the SmartHub settings except immediately after a factory reset. It will not allow me in, stating "insecure connection" sometimes, or the "Hmmm" message
Tech expert at BT viewed live via my mobile to see the problem, and was totally perplexed. I have tried absolutely EVERYTHING, to no avail.
This is driving us mad, as we cannot do much these days without the internet. If I learn anything on Thursday, I will post.
