Hello. I decided to change my "Pre-shared Key" password(because it was way to long, the default one) so i went to Setup>Wireless Settings>Manual Wireless Network Setup>Pre-Shared Key after changing the password everything seemed normal then i went to my 3ds to test if it works so apparently it didn't so i went to test my internet connection and it was not working after that i decided to reboot device and do everything from the beginning but at the bottom of the screen, at network icon appeared exclamation mark. When i finished all the setup's the exclamation mark was still there and still my internet connection was down. I tried everything but nothing workt out. It worked 2 weeks perfectly until this password changing...
Sorry for my english.