Can anybody help with a curious problem.I have a cable modem 512kb/s.I havent had it long.When i am browsing on the internet the speeds seem really good,but when im downloading i have problems.I have been downloading of p2p sites for a while through a dial up connection but thought it was about time i upgraded.Anyway when i start downloading a file i get really good speeds but when i leave it running for a while the speeds drop of and slow down to next to nothing.This would be bad enough but if i try to browse on the net i really struggle for any sort of speed,until ive been browsing for a couple of minutes then everything speeds back up.Its as if my pc and modem are falling asleep and take a while to speed back up.This sounds stupid i know but has it fallen asleep?.