I was fortunate in that they agreed to replace the machine. Though I think the person dealing with it gave really good customer service. I got the laptop in the UK and now live in Singapore (surface book not here??). So the arrangement was to send it to a UK address and then I collected from there and the faulty laptop was then shipped back via their courier to Microsoft.
I would persist and visually document the fault, my guess is with prolonged use it will get worse.
I think the MS warranty seems a little weak. Take a car, major components have a longer warranty than the small stuff. I think this should be the case with IT as well.
Good luck!
Happy Christmas and New Year (less the laptop part...)