Hi to you from David, 'The Famous Forry'
This could be the brushes in the motor , so I suggest you unplug your appliance first, Then remove the main motr and check the carbon brushes for wear. This is a very likely cause of your problem. Brush sets (x2) are easy to change and cost about £20 a set. I can help you find these if required and any help in dismantling, rebuilding is on hand if you need it regards David, 'The Famous Forry'
thanks, XXXXX XXXXX try removing the motor tomorow, as i havent time today..
Ok come back if you need more help and don't forget to remove the plug first! Best wishes and Happy New Year regards David.