Samsung Rogue charging glitch

I have a samsung rogue. It has started doing this thing where after it's left on the charger, it gets lines on the screen. It looks just like this, except they move: http://www.codeproject.com/KB/graphi...ge_waves_1.jpg
However, it does quit doing it after a little bit off of the charger. Is it anything I should worry about or am I fine to keep the phone? Has anyone else had this problem?

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Is the phone/battery hot?