FrameRate get slow when scene replace multiple time

When I start running game on my android device and play 1-3 or 4time it has run smoothly. but when my game scene replace more fps get slow.

Can anyone help this problem?

thank,

Maybe memory leak?

thank diitalien for reply me,

I know that too, but can u give me some idea about how to manage that memory?
because my game is about endless game so I need to add all sprite in entire a scene. I also use to auto add sprite when camera arrive each position but it scene stop during run code add function.
Give me some idea pleas?because I am new on game development.

thank,

You can use VLD tool to detect memory leak. Trace log from bottom up. https://vld.codeplex.com/