So i've been playing pokemon a lot lately and everything was fine. The game worked perfectly in the morning and throughout the day when I went out, but once I returned home and wanted to play again my 3ds wouldn't start the game. It had the pokemon icon on there so i know my 3ds knew it was inside. Once I started loading up the game the whole "black screen of death" popped up and told me to restart my 3ds. I retried and even took the cartridge and blew on it and inside the place where it goes and still nothing. I put on some other games like mario party or luigi's mansion and they worked fine! Even the games I downloaded from the e-shop work and everything, just my pokemon Y won't start up! Anybody out there have any idea why this is happening? Do I have a faulty game cartridge? I put in like 70 hours into the game and it's very odd that all of a sudden this happens. Will I have to buy another copy of pokemon Y? I don't mind buying another copy but I don't want to do anything drastic and lose all of my pokemon and time put into the game until I know if this little problem is fixable or not :/ Hope you guys can help me out here 
Thak you for your time! 
P.S I've read online something about some pokemon games having problems with SD cards, but my problem hasn't mentioned anything about SD cards. The game doesn't tell me it has to do with the SD card or that my info is corrupted or unreadable or anything. I've even taken the SD card in and out and still nothing works 