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Was this device purchased 'used' or 'refurbished'?
It sounds very much like the screen was replaced.
The waveform data is stored in an eeeprom on the display cable and it is matched to the display.
Replacement screens do not have this chip loaded with data.
Some methods of replacing the screen will result in only a temporary copy of the correct waveform data to be used - but not to write the update to the eeeprom.
This method is lost in a "reset to factory defaults", a dead battery, and/or a cold re-boot.
If not purchased 'used' or 'refurbished' - then suspect some failure that would prevent the eeeprom from being read (I.E: cracked or loose display cable).
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