I have some experience about Android phones (but i'm not an expert) . I have problems with my Samsung Galaxy S2 (GT-I9100) . Its battery heating too much, there are a lots of applications, sometimes ...
it seems to me that my sd card is damaged so I wiped/erased it from android few times but it did not help. Right now what happens is that if the card is present the phone freezes (not always) at the ...