Sony Ericsson Xperia X8 freezes

My Sony Ericsson Xperia X8 often gets freezes. Why is this happening?

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It may happen for following reason-
1.The phone may react very slowly if too many features or applications are running or if too much memory has been blocked.
2.If free memory is low, this may slow down your phone or mean you won't be able to save new files.
3.When you open files that are transfered directly from a computer to the phone or via the Explorer function on the computer, the phone might hang or freeze if the file isn't compatible, has been corrupted, or is very large.