Are you aware of any FLASH corruption issues with STM32L431? (I have checked latest errata)

[MCowp]

To finish my question: We have seen a few instances of units ’locking’. When we try to read the FLASH we get the message “Cannot read Memory – Disable Read Out Protection and re-try�? .  We did not enable read out protection in the first place so it looks like the FLASH has somehow become corrupted.

[Tesla DeLorean]

Often a comms issue​. Haven't seen any issues with L432 parts. Does any of your code write to memory? Did these parts work and test properly previously?

[MCowp]

Yes we write to memory. Proto units have been functioning ok for a few months now. But occasionally we get this lock up. Seems to coincide with power cycling