I have five Lost Vape Therion 75c, and one Mirage mod.
They all use the Evolv DNA75C board.
I never had any sort of problem with those mods, and I use them quite extensively.
This to say, I believe the failures you experienced, are likely to be caused by a factor external to the board.
Humid or salt-water environment, excessive temperature swings, excessive electrostatic charge (carpets), excessive RF fields, and many more could be the cause of your multiple failure.
Once you are 100% sure that there are no external causes of failure, only then, consider you have come across three defective DNA75C boards.