Hello.
The Ruumba, like all things mechanical needs a bit of maintenance every now and then to keep it working the way it should - for longer. Try checking these maintenance items to see if everything is in check
* Is the dust tray clean and emptied. Is it blocked or obstructed? Is it seated correctly?
* When was the last time the filter was changed? its recommended to be changed every 2 months - but this comes down to run time and environment. Have a look ? - Give it a few taps on a wall outside!
* Are the Multi surface brushes clean and do they rotate when running? Check the spindles on the sides (what they rotate on) for the build up of hair / fluff that obstructs their rotation