I got a G2/P2 a little more than a year ago, it was working fine at first but then random black lines began to appear, so I quit playing with it. Today I looked at it and turned it on and the screen glitches reappeared, but now sometimes the whole screen turns black. I found that pushing hard on the back makes the screen turn to normal, but does anyone know what could be wrong? Could it be the Tamagotchi or the batteries?