Downloaded Inssider doesn't seem to tell me anything useful and the link to the user manual does't work
You should have a list of wireless sources it can see, and below that probably the welcome box. There's a tab between the two. You want the 2.4GHz one. It is only a graphical representation of the list, but a lot easier to understand.
Channels overlap 2 either side, as you will see there.
You have two problems. The major one is the 72Mbps. That is limiting your top speed - you need at least 130Mbps. It wouldn't have shown up on a 40Mbps connection. We can work towards that soon.
The variability that wasn't there on 40Mbps may be explained by Christmas presents, as I said before. Or Christmas lights, or a number of other possible factors we come across now and then. We just have to progress in steps now if you want to go back to wireless.
If you are happy on wired, then that is easiest. But you possibly have reasons for wanting wireless working well.
The minor one is to examine the graph and see if there are are less occupied spots than where you are. You can set your router to wherever you want. Very busy areas are where you will get interference, which has a similar effect to congestion. To some extent explaining the variability of what you were getting.
I forget - is it the Plusnet router, if so which? I don't use either of mine because I rely on wireless and they are poor.
See if you can get that far and let us know

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My broadband basic info/help site - www.robertos.me.uk |
Domains,website and mail hosting - Tsohost.
Connection - Plusnet Extra Fibre (FTTC). Sync ~ 54.0/14.9Mbps @ 600m. -
BQM
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Edited by RobertoS (Sat 29-Dec-12 21:20:17)