Slow network with e1000

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http://unix.stackexchange.com – I've got a problem with my network speed. I sometimes have full download speed (i.e. 5 MB/s, which is about my max. internet dl-speed) and sometimes comparable slow speed (about 0.5 MB/s). This is affects both internet and home network! When I got slow network speed it stays that way until I 'renew' the module for my PCI network card (sudo rmmod e1000 followed by sudo modprobe e1000). Then I've got full speed again for at least a few minutes, if I'm lucky even for a few hours... I've got no idea where to look for such an error (and how to get rid of it). Any help/suggestion is appreciated! (HowTos)