Some months ago I upgraded my router from the awful TT one to a Netgear Nighthawk X4S D7800.
I immediately saw a massive improvement in stability, whereas before, the connection was dropping 5+ times a day, it seems monthly now.
Additionally, my speeds went from around 20Mbs to 30Mbs with a stable connection.
I am now lucky if it hits 18Mbs.
Could this be throttling from TT? I would not have thought it would be contention since I would still expect to connect at the higher speed just not reach them.