Reloading current scene make game laggy?

Hi, i have created a mobile game for android. When i load it on my phone, the first scene i see is the menu. This works fine. Then i press a play button and it loads the main game scene. This also works fine with no lag. However, when the character dies, buttons appear that are play again and go to menu. When i press play again, it reloads the scene fine, except the game gets really laggy! Does anyone know why this happens and how to fix it? It is really annoying!

I use Application.LoadLevel(Application.loadedLevel); to loas the scene again, to play again.

Any help is greatly appreciated, thanks.