What do you mean by starts again ,do you mean you can push the start button and away you go ,or does it just start of its own accord ?once you reset either the RCD or MCB
bit of a long shot but also look for a TOC embedded in a white case ,check there isn’t a hairline crack in it causing a track to earth as it expands with the heat
so its the RCD so your looking for an earth fault. could be a sagging element, bit of carbonised fluff in the wrong place, leaking hot moist air
also bad joints in the mains cacle feeding the machine as sparking can trip RCD’s