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Some of the events I set are not followed at all: My character is supposed to shoot a laser upon pressing "A". This works for a certain amount of time, but then inexplicably stops. Also, an enemy that is supposed to be killed by that laser is not, and the enemy is not shooting the projectiles that it was assigned.
You might possibly be running into the object limit (frames have a default limit of 500 active objects, I think - it's increasable to 10,000 through the frame properties). You should make sure that your projectile objects are cleaned up when they're no longer needed, for example by destroying them when they're a certain distance away from the window.
If thats not it == Please upload your file and I am sure people here can almost instantly tell you why your file is operating like it is.
But it does sound like your running out of objects