Lost config after a few hours

I use the Wizfi360 modules in my own hardware and have configured them permanently as an AP with its own SSID. I have 500+ modules in use.
Now I have a second module which does not keep the saved configuration and switches back to the default configuration after a few hours. It keeps the configuration for 1-2 hours without power and loses it after 2+ hours.

All 500+ modules have the same wifi config, but only two of them making problems.

What could be the reason?


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