Sorry for the delay but in these months I've been monitoring the problem but I still can not identify what might be causing it.

The initial problem persists and another thing I forgot to report is that when I am downloading a "torrent file" on a secondary machine, connected by cable, the connection on the primary machine is unstable and it is impossible to even surf the internet. Even if the torrent download is only using a part of the bandwidth and with few connections.

Can someone help me with these problems?

@FabricioHM i have the same problem .. just come her for this

@FabricioHM I too am experiencing this issue.

Furthermore, and I'm mindful that the support guys might point to this as proof that it's not the router's problem; prior to installing my TD-W9970 I had just upgraded to fibre and was issued a BT smart hub (provided by Orange which is the same company in the UK). I had dreadful connectivity issues, much like those described in this thread, and has several engineer call outs which did not resolve the problem.

I replaced the BT router with the TD-W9970 and the problem went away, but has crept back over time.

I have one thing to add however, and this could be coincidental but ....

I bought a new mobile phone since installing the TD-W7770 and the problem went away for a few days - on the new device - but has since re-occurred (on the new device).

I am completely mystified, and not far away from replacing the router with something else in desperation - perhaps re-installing the BT Smart Hub.

Is there a way to escalate this thread to tp-link support? Do they review these issues?