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looks like a bit of a shonky install
Was my first thought too!
the wire in the plug pulled loose and was making an intermittent connection which can cause stuff to overheat
This happened to me with an old hoover. When I opened up the plug thinking the fuse must have gone I realised the neutral grub screw was completely loose. Killed the hoover when it popped which is probably preferable to starting a house fire!
Arducius
Others will have far more knowledge than me but it looks like a bit of a shonky install. The cable outer has been stripped way back beyond the plug which shouldn't be done. Could be this meant the wire in the plug pulled loose and was making an intermittent connection which can cause stuff to overheat.
Or they may have wired a high draw appliance into a plug, have a look at the specs for the oven to see what the power draw is.