Probably you’re doing the classic: if animation is 1 >> set animation to 0, if animation is 0 >> set animation to 1.
And in that order to get stuck in 1 
If it’s the problem, don’t worry, is a common issue, both events are running in the same frame. Here are two ways to fix it: [url]on/off Button for Background music]
If you go for the second option (useful if you switch two values only) you just need one action.
Merge the two animations and set the time between frames to 3 seconds as suggested above is a good idea too, you can pause animations and set frames manually through events if you need it.