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Task managers don't do well closing apps. If you truly mean RAM, try force close from manage applications in settings
Task managers don't do well closing apps. If you truly mean RAM, try force close from manage applications in settings
RAM is there to be used
Unless the phone is having problems, I would ignore how much RAM you have empty. As danfrance said, RAM is there to be used so let it be used. If there's a problem with how your phone works, such as slow animations or freezes, then maybe there's a good reason to look at possible causes, but until then I wouldn't worry.
If I were you then I'd try closing apps one at a time. Sounds like you've got a rogue one in there doing the nasty with your phone.
Find it. Kill it. Leave it out with the trash.