ive got this problem too...
i think it might be a hardware problem but im not sure which component is causing it. the drivers are fine, ive tried ethernet & wireless, ive got an antivirus + tried on clean install, and cpu and network usage is low.... im connecting over ethernet atm but even if i was on wireless my router automatically changes channel to the best one for less interference. ive got a bt hub 5. and i tested on clean install too so i dont need to go to a backup.
also i lose connection about once an hour. very annoying. the speed varies a lot. never goes to the full speed of internet though. other devices have no problems. i had a wireless adapter in my pc before, it was just as slow as ethernet. i moved it to another computer, and it was fast. SO its a hardware problem (probably).
my specs are: intel core i7 4770k, gigabyte z87x-d3h motherboard, crucial 1333mhz ballistix ram, seagate 1tb hdd, samsung (tsstcorp) dvd drive, coolermaster power supply, nvidia geforce gtx 680 (4gb, palit, jetstream), coolermaster case.
my ethernet/lan driver is made by intel.