I had 5 different gateways on the 13/08/14 and when i checked the speed on 14th was still getting 38 download.
checked again on sunday and gateway checker didnt know which gateway it was.
speed 34 so did a reboot of router leaving it off for 10 mins before reconnecting and still only 34 download
test just now say 34
had some thing similar on the 27/0714 when it dropped to 27 down and after a few days was back up to 38