Help Samsung Moment Keeps Freezing...!!!

[SoCalVamPirate]

So, Ive recently noticed that my Moment will freeze in Lock Mode and when it catches up, the screen will flash green, red and sometimes blue. whats the cause of that?

Ive since taken off the face plate i bought for my phone. Hasnt happened much since then... but whats usually the cause?

 

[Yay 4 Juggs]

hasnt happened much or at all since removing the faceplate? given the type of screen i cant think for the life of me why the faceplate would be causing the issue.