It's under warranty, insist that they fix it (I'm assuming you already checked it's not caked with dust).
On a somewhat related note, I have a strong suspicion high operating temperatures makes laptops inherently less reliable than desktops. My Thinkpad X220 became practically unusable at year 6 with the CPU fan always on maximum and the simplest tasks taking forever. I've seen this happen to all kinds of notebooks, but much faster to cheapo ones and refurbished laptops, while my desktop machine ran without a hitch for many years on the same motherboard and CPU.
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