If you have a GTech Airram, try taking the brushes out to clean them...

[JsOtherHalf]

I was horrified.

I have cut the hair caught in the brushes since buying it, but never taken them out. I have got rid of various gunk and fluff, as well as hair wrapped around the bars connected to the battery pack.
Fingers crossed I have put everything back correctly...

www.gtech.co.uk/media/mconnect_uploadfiles/r/e/replacing_airram_brush_bars.pdf

My job this weekend. Thanks for the link, you saved me a Google!

Learn from my mistakes.

Take out the dust collector part first...

There is also a little brass nut that goes between the bar and the end caps; do not drop that into the bin and have to fish it out...