ive had my biocube for about 2 months now, and a few weeks ago one of the fans started to make some weird noise. i found out that if i tapped the side it would stop. eventually i realized that if its left alone for about 10 mins the noise stops and the fan runs normally. now about 3 days ago teh other fan started making noise, itried doing the same thing (tapping the side) and it works for about 5 seconds adn then the fan starts making a weird noise again. i tried opening up teh hood, but i didnt see anything out of the ordinary...anyone have experience with this? any ideas on what it might be? its really annoying...