Ios popToRootViewControllerAnimated causing Memory Issues - ios

Question

I am making my SpriteKit game. When the player dies, my goal is to have the game transition back to the start screen. This is accomplished by the code below. However, I notice that the memory increases each time a new game begins. Xcode Instruments is not showing a memory leak. When the memory reaches roughly 150mb the games frame rate drops and the game become unplayable.
In the GameScene I call this function when the player dies
func gameOver(){
if let block = gameOverBlock {
worldNode.removeAllChildren()
worldNode.removeAllActions()
worldNode.removeFromParent()
self.removeAllChildren()
block()
}
}
Back in the GameViewController the following functions get called
scene!.gameOverBlock = {
[weak self] in
self!.goBack()
}
}
func goBack(){
scene!.removeFromParent()
navigationController!.popToRootViewControllerAnimated(false)
return
}
If anyone has any ideas as to how I can accomplish this without a memory leak, it would much be appreciated.

Answer 1

After commenting out tons of code, I have found the problem. The methods that I have posted above were not causing the leak, as Matthew suggested, there was a strong reference in the middle of my code that was stopping the ARC from releasing memory. Ill post the problem code incase anyone else may have a similar problem.
In my GameViewController, I had the following block:
scene!.zoomInBlock = {
self.scene!.size = CGSizeMake(self.scene!.size.width / 2, self.scene!.size.height / 2)
}
The correct way (without causing a strong reference) to write this would be:
scene!.zoomInBlock = {
[unowned self] in self.scene!.size = CGSizeMake(self.scene!.size.width / 2, self.scene!.size.height / 2)
}