If it is less than a year, it should be covered by the warrenty. I am in the U.S.A., so I don't have a store to take one back. When I had an issue with an Aura 6", I contacted Kobo, went through a few rounds of "things to try", and then they sent me a new unit. I did not have to return my defective unit until the replacement arrived, but my problem was different than yours, so you may get a different request.
If I were you, I would take it back to the store and see what they will do.
Good Luck!
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