just get vacuum cleaner air freshener (deodorizing sticks or scent tablets). keep it when emptying your dyson, and keep using it by hoovering it in again. the bad smell may not vanish completely, but at least is overlaid by the fragrance.
To wash, use warm soapy water manufacturer recommends for cleaning. I've washed mine with dishwashing liquid used generously under running warm water. That didn't remove the greasy oil spots completely, but at least they vanished a little and got brighter.
I'd try to pair it with another bluetooth device (to narrow error causes). Otherwise call UE Customer Service Mon-Fri: 6am - 6pm (PST): +1 646-454-3200 (be sure to have your Serial Number, Part Number and Model Number ready).