Game Boy game cartridge file deleted itself, battery is a 2016 from 2013 and measures 3 volts

[gbpxl]

I assumed the battery voltage dropped and that was why my save file deleted but I get 3 volts. Has this happened to anyone? Metroid 2 Players Choice NTSC if youre wondering

[Gameguy]

Sometimes saves can get randomly deleted, it's happened to me a few times since first owning the system. Just make sure the contacts are clean as it will minimize issues. I'm assuming the battery is replaced properly and not just taped in place.

[gbpxl]

yeah its soldered in and making good contact. I had a Pokemon save file delete on me before but I think that may have been due to the Missingno glitch more than anything.

[gbpxl]

Is this something like how if you didnt hold down reset while turning the power off on Crystalis or Zelda, the game would sometimes delete your save file?

[gbpxl]

I fired up Kirby's Dream Land 3 yesterday. Screen didn't display anything which was unusual since it was working fine a bunch of a times before. Take the cartridge and re-insert it, fires right up. Go to the file select screen and all my save files are gone. I checked the battery just now. It is original to the cartridge but measures 3.05 VDC. So another case where a battery measures good voltage but the save file randomly gets deleted.

[Gameguy]

If the screen didn't display anything then the contacts had a bad connection, that's what erased your saves. You reinserted the game which cleaned the contacts just enough to get it working again, but it's not going to be reliable. Clean your cartridges, clean your cart slots. Same for memory cards for systems that have them.