It's kind of confedential source code,
I've finally solved it after 5weeks and 21hours and 40minutes fiddling around.
What the problem was i have over 20 activity pages, they all have to load in some point,
What happens is when 5-7 are still opened, the memory increases and phone can't handle so much activities opened.
so it flashes.
How I solved it is,
Called finish in all buttons in every activity, I tested app and WOW! it worked.
Enjoy it on Android Market.
"Falling In Air" or "TakeShine".
Thank You for trying to help me, really appreciate it man