HP30B retunrning to "default values"

[ElectroDuende]

Hi all,

I have had this HP30B unit for about six months; it has the suplied batteries (panasonic) and lately I've observed that, randomly, it reverts to default settings of language, decimal marker and... chain calculation AGGHHH! I don't store any program in it, so its not a major problem to re-configure it, but it is quite annoying when happens.

In test mode, first time you reach "tst Battery", displayed value is 2.400, but if you press enter, it will always show 2.9 / 2.900. Why is it like that?

I don't currently have any spare 2032 cell to test... but no battery warning has ever lit while I use it... is this the usual behavior when batteries are low?

Thanks!