3rd Gen Pokemon sapphire bug or issue

[Motioncaster]

Hey. I recently got a copy of Pokemon sapphire for by gba. My Pokemon are as follows: Kirlia, Sableye, and Lunatone. I love this game but after playing for about 17 minutes or so the game restarts for no reason and I'm brought back to the title screen. My save is still there but I didn't save soon enough because you never know when this will happen. I tried swapping cartridges but I run into this issue every time I catch Lunatone. I tried swabbing and blowing into the cartridge but nothing seems to help. I've even switched gbas but the result remains. Any help?

 

[Imperator161]

Does this happen when you do anything else? And is it when you encounter Lunatone, when you successfully catch it, etc.? Also, do you already have a Lunatone on your team (and you're just catching another one), or is when you try to encounter/catch your first one that you have a problem?

If it's a recently bought game, it sounds a little like a bootleg to me, but I'm not sure. I don't know where you bought it from, but are you sure it's genuine?