i own an r4 sdhc dual core (r4isdhc.com) and the r4 gold pro (r4i-gold.com). both of my flashcards don't go into sleep mode in my 3ds or xl, instead when closed they play distorted noises from the games they're running and stay on. this is weird because i've also got an r4i 3d (r4igold.cn) and...