Does not vacuum effectively

Miele vacuums are famous for having hair and carpet fibers getting caught in the roller bearings. That can cause a bad smell. The motors in Mieles are very well built and I have a hard time believing that the suction motor is going bad in 1 year.

The burning smell may be the motor that's on its way out. Vacuuming with a blocked pipe or sucking up liquids may cause the motor to burn prematurely. The motors arent very expensive, but on the small vacuum cleaners it is sometimes more cost effective to go for a cheap second hand vacuum than to fix it. Depends on if the guy that fixed it is trustworthy, but i can guarantee you the secondhand machine will not have a lifelong guarantee on it. ask for prices on the motor and decide which you can afford.