Were the pumps running with an open faucet when they just stopped, or had they cycled-off due to reaching shutoff pressure and then would not restart?
Most of them have an internal thermal protection device with auto reset which might take hours to reset - did you try them again after a
long period of shutdown?
Have you by chance disassembled the failed pumps to look for any signs of the reason (e.g. locked rotor, indications of arcing, etc)?
Checked your karma lately? (joke - nothing personal
)
Now that you're set up with a quick change spare, the current pump will probably run for 10 years