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I have got a shark duo vacuum cleaner which is 6 months old. It sharted making a loud noise when in use. I watched a few videos and cleaned it completely but still no luck. However, it seems the brush roller is the problem and noise becomes louder when I use it on the carpet setting. Does anyone have any idea what could be wrong?

Of course it is still under warranty. That being said, here are the repair guides on your model that might help: Shark Flex DuoClean Repair