Hi Chris. So the problems seem to be streaming. My computer will not play Youtube 4k videos very well (keep stopping and buffering), Youtube 4k videos through Tivo Box are jerky. Same if watching direct through Smart TV. I have a Bluetooth speaker in my kitchen connected to Alexa, listening to the radio is hit and miss as it stops and starts regularly. Last night we used a website called iFollow to watch a live football match which wasn't on Sky TV. It was a very poor picture and kept buffering. The speedtest results still vary wildly, sometimes 160 - 180, but most of the time between 40 - 60mbps. Turning the Router on and off makes no difference. All this after new Router and Boosters.
Does it work better on a wired connection?
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What speeds do you get at >> speedtest.net << with a direct connection using a Cat 5E or better cable between the Hub in Router Mode and a 1Gbs capable Pc/Mac/Chromebook and no other devices connected ?
Can you set up a Broadband Quality Monitor (BQM) at thinkbroadband.com - this will give you an insight into what is happening with the signal at the other side of the Hub, it will take a few hours to get any kind of trend showing although you should post the link straight away.
Post a 'Live Link' to your BQM on here.
Instructions for posting BQM Link
Under your BQM graph are two links in red.
Click the lower link (Share Live Graph) then click generate.
Copy the text in the Direct Link box, beware, there may be more text than you can see.
On here click the Link icon (2 links chain to the left of the camera icon)
In the URL box paste the link you copied and in the ‘text to display’ box write My BQM then click OK - you can post the link straight away.
I did that back in August and the results were very poor (red lines all over the graph). An Engineer was sent out who tested the cabinet at the end of our street and confirmed there was a problem. He did some rerouting and now it doesn't drop, but nothing in the house seems to work faultlessly, and the speeds are all over the shop.