Ongoing reduction speed issues

[#1]

Consistent issues with speeds dropping.
All fine and averaging 40meg (line capable of 60+meg)
However, again speeds averaging 2 -3 when not dropping out completely. Changed wireless channel multiple times (as directed by customer services) and previously speeds increased...funnily enough not this time... so
How come my average upload is 12meg and ping around 80 and download a pathetic 2meg?

[#2]

Have you tested a wired connection to see if the same issue happens?