Yup the DPFE sensor can cause mischief, but you didn't post any trouble codes, saying the computer was unhappy with it & the DPFE sensor wouldn't likely cause the computer to go belly up imo!!!!! It senses the pressure difference between intake & exhaust manifolds & sends the computer a feedback signal to have it calculate how often & long the EGR valve needs to open to feed exhaust into the intake manifold, to lower combustion chamber temps to control N2O & prevent spark knock. BUT the EGR valve isn't online when the engine is cold, or at idle, so imo the DPFE sensor isn't likely causing the engine to stall & isn't likely to be causing the computer to fail.

BUT something electrical acting out, causing online voltage spikes, sure can. Something like an RF transmitter with higher than normal output, not properly installed, some piece of faulty aftermarket equipment, forgetting to disconnect the battery when recharging it & having the battery charger with excessive ripple fry things, acting out alternator voltage regulator, faulty battery cables, shorting battery cells. Lots of unusual possibilities, so keep an open mind when trying to think through your trouble shoot, no matter what you've recently done, leave everything on the suspect list until you can do some trouble shooting to narrow the suspect list down some.

I agree with doing some tests before installing the new computer, as having this many computers fail so soon, sure smacks of something electrical frying them.

If you decide to have the alternator tested, consider pulling the battery & have it load tested too.

More thoughts for pondering, let us know how it goes.