This seems to be a common problem but no solution posted on the internet. My issue is computer specific and has problem with any wifi signal.
MBPS go down to 1.0 then back up to 36 (rarely 54 unless next to router box) EVEN THOUGH I AM NOT MOVING AROUND. Variable MBPS I thought was a function of distance so shouldn't change if not moving.
I get slightly less bar strength compared to other computers with Atheros instead, but quickly drop to 1.0 mbps regardless of bars.
I try the usual update drivers but it says i have the latest.