Catpiano, go to their website and contact their tech support. I just called them yesterday and they will send me another one coz mine is very noisy. Just do it quick b4 the warrenty is over!
OH SH_T !
Day time dont talk people .. nite time dont talk ghost ..
call them anyway! they gave me an option for if mine is over but i didn't pay attention coz mine is still under warrenty. you might want to just check with them. it doesn't hurt!
This is a description of the problem Roomba's have with the brush gear case. The problem lies in hair getting in around the bearings and gears that drive the brushes.
The folks at iRobot have been busy listening to their customers and improving their product. The new generation of Roombas have a head cleaning module with a sealed gearbox. The best part is that it is retro-fittable into the older generation roombas.