Some while ago I was having problems with drop-outs. Following the advice of the forum members I tried various ways to solve this and eventually by disconnecting some redundant wiring the connection stabilised and the download speed improved from around 11.5 Mbps to 12.5.
I then bought a TP-Link TD-W8970 router and this again improved my download speed to a typical 14.5 Mbps and the ping went down from 25 to 15ms.
I check my speeds regularly (it has almost become an obsession) and today, for no apparent reason, the download speed shot up to 16.5 Mbps and the ping is down to 13ms. Nothing has changed at my end since I installed the new router back in March.
I am of course not complaining but wonder if anyone else has had a similar experience.