Actor only moves the first time.

DelaneyC

I am making a basic endless runner game as a first project and have run into a problem. I have set up a rule so that my actor will jump up when i press space (change linear motion Y). When i try to test the game the player does not jump and just continues to move along the platform until it falls off the edge. I noticed that if i save the game, close out of GS, and then re-open my game the actor will actually jump and preform how i wanted it to but only one time. After closing the preview and trying to preview it again the actor does not move when i press space. I have tried remaking the rule multiple times and also re-doing the "change attribute" feature but nothing seems to work. Any ideas on why the rule would only work one time? thanks!