I would contact Sky to arrange a replacement. If it's red hot to the point it's making the surface hot I wouldn't mess around and would just try to replace it.
You can use the Sky Help portal to contact Sky. If you want to speak to somebody, you can click "Need more help?" at the bottom, and within that content you will see a phone number (we can't post phone numbers in this community).
Separately, is the puck in a space that's well ventilated? Eg: it's out in the open and isn't covered up?
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Sky Stream customer. Past user of Sky Digital, Sky+, Sky+ HD and Sky Q. 3x pucks. Main TV is an LG OLED with Sonos Beam.
