Hi.

The "short term" memory (80 minutes) use a little battery to work.
Lifetime for the battery are most often 5 years or so, the same as i.e.in a PC mainboard to
backup Bios etc.
A replacement should fix that easiy, but to save your settings on a floppydisk or whatever
media the different keyboards use, are always a good idea.

I also you'll find something about this matters in the usermanual.

Happy Playing
GJ
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)