Hi there! i was playing Sonic on my r4 recently, and when i tried to enter a building, the screen went black and stayed like that forever! The music was still playing so i thought it just froze which also has never happened before with my ds, but i just ignored it. then i tried playing it again, and now it does that all the time! (entering building, battles, ect...). Any ideas on why it might do this, or how to fix it?