Sonos doesn’t have a repair facility, nor do they have authorized repair facilities run by other companies. If it’s still in warranty, you may want to contact Sonos directly, and see what they say. 

The Earth is quite large, and your profile does not indicate which area of it you inhabit.

If you are in a location that is an island with a monarchy and a parliamentary system, you may be able to get assistance at sonosrepair.co.uk