If I had to guess, it may be radio noise/frequency interference. This is a bigger problem on 2.4 GHz channels than on 5 GHz, but 2.4 has better penetration on walls and such. Maybe try changing the channel from the default to something else?
FWIW, I get around 90 Mb/sec hard wired to the router, and 18-30 over wifi, depending on which laptop I'm using and where in the house I am.





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