hi how are my friends? i have a so bad problem with my galaxy tab 7inch. when i bought it it's os was android 2.2 foyo. 3-4 month it worked good but one day it turned off when a incoming calls arrived. therefore i go to samsung solicitorship and says this problem. thay flash my galaxy tab with android 2.3.3 but nothing fixed and also problem exist. de novo i go it for fixing but after 14-15 days its problem fixed spontaneous. now after 1 month i have this past problem. and my tablet turned off until my charger connected to it . what is this ill? i am sure android have nothing problem on it!