[Q] galaxy s2 i9100g problem

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galaxy s2 i9100g problem

my fren's galaxy s2 is facing this problem
http://www.youtube.com/watch?v=wq5gU...ature=youtu.be
automatic touch without my finger
sometimes only,
due to this problem so hard to capture,
and this problem just happen when i wanna to flash something
when i wanna to call someone, it will auto and touch randomly
and other apk too
how i fix this problem?
is this software problem(i have changed many roms from stock rom to unofficial rom but still same problem) or hardware problem?
sry for bad english