I am also having the same problem; since day one, am using no exterior case on my S3. T-Mobile store said that my apps were using too much memory & to go into 'Task Master' and do a memory dump... Well it made no difference.
I had occasion to talk to a new 'S4' user; he admitted to having the same problem. Go figure.
I don't like the idea of having to constantly check the settings on my phone.
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