Hope you had a good Christmas! That is a pretty unusual failure for the ESC. They very rarely fail and I’ve never seen three MOSFETs fail at once. Is there any chance that it might have been connected in reverse or there was any short circuit?
I saw your other post about mounting with silicone and I would definitely suggest finding a new mounting method. The MOSFETs (six little black boxes, three of which exploded) are one of the primary heat sources and silicone will insulate them very well so they can heat up a lot. We have seen failures before from someone who put several ESCs in a box and covered them in silicone for waterproofing.
The only other thing I can think of is the 5V regulator, which is officially rated for 500mA but will generate quite a bit of heat at that current. How much 5V power (if any) were you drawing from the ESC?
You can send me an email at email@example.com and we can discuss replacement.
I’m sorry for the trouble and the inconvenience! Hopefully we can get the issue sorted out so it doesn’t happen again.