you can show them this thread or the reports about this issue, that Nokia is considering this under warranty to them.

i recently reported this issue to the nokia care at my location, at first, they said that this fault is due to poor device handling, and not be seen under warranty.

when i e-mail them back, with the proof that Nokia Corporate has seen and will take this in warranty, they replied that i just need to call them and make sure that my device has no physical or liquid damage then send it to them for repair.

i also believe that i told them that i have no issues, i even put the e-mail subject to an inquiry, not repair or something,