My actor gets stuck on the ground

My game is coming along very well, and I used the Jump and Run kit to make it. All I've done is change what the actor looks like, and instead the tiles it gave me I used my own. But now every now and then I get stuck on the ground. Can anyone tell me why this is happening? Here is the demo: http://www.stencyl.com/game/play/30635

Just jump and run around, and eventually you will see what I'm talking about.

I see what you mean it usually happens when you have one live left , did you create the behavior yourself or got it from the forge ?

I wasn't able to get stuck, although your description of the controls is off.  Z was jump and X was fire. 

Sorry bout the controls, I will fix that. As for the health I made that myself, but I noticed that before I had the health (which was implemented two days ago) he would still get stuck. Any thoughts?