I really don't know if the problem of my S3 Mini is on its battery or what? because every time I used it, like for example using wifi, facebook, games and each. it restarting all over again and again. then what I did is to put out the battery to turn it off. then when I try to turn it on, its just the same, the introduction SAMSUNG GALAXY S3 MINI then the logo of SAMSUNG then again its all that happened. then I put out again the battery then charged it and it opens. but the battery is 80% or 70%. please help me guys! thanks a lot! =(