bad battery in FG60D-POE, system does not retain config even with replacement battery

I have a number of FG60D-POE which do not retain their config when AC power is removed.

I tried replacing the internal battery (CR2032).  However, the issue remains.

I've read others having similar batter issues (on other models).

However, replacing the internal CR2032 battery solved their issue.

Q: Is there a 'trick' (or something special which needs to be done) for the FG60D-POE?

Thank you in advance.

--tony