Older multi temp kettle was cutting out at 50C, further investigation showed out it was the relay coil going open circuit when it got hot. As it cooled down it worked again. Not that uncommon a failure mode for a relay but what surprised me was that the tiny sub miniature type they've fitted in the kettle itself can switch 3KW and deal with the inrush current, but obviously it can ;)
This design has all the 'lectronics in the kettle itself, I see the new ones have them in the base, maybe they have a larger relay :)