The data of the EEPROM disappear suddenly in ATxmega64A3U

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#1
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I use ATxmega64A3U.

I use it to store the set points of the ID information of the terminal and each function in an EEPROM.

 

Sometimes, The contents of EEPROM data disappear.

When I change battery connecting to this terminal, I put the phenomenon that data disappear well.

 

Will there be really the phenomenon that these data disappear and the relations at the time of the battery exchange?

 

Can you take measures by hardware and software ?

 

Thanks

 

kenji maehara

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Use BOD. (so the chip don't run under power down)