android Xperia X8 often restart itself

This problem always disturbing my green robo ( Xperia X8 ). In one day, this is problem occur until tree times. So this problem will restart my phone by itself.

I think this is because by application which installed on it. X8 which not root yet cannot instal application into external memory. Many application which running need more RAM and phone memory until this will make X8 will restart itself.

So just install the application what you needed. don't install the unusefull application. Hope help you, thanks for visited,