Performnance Issue with Interactive Animation

Hi all. We've created an interactive animated infographic that's got some performance issues. It lives here:
https://lunchwithravenandcrow.com/images/ANM/LCfolder/ANM-LeadershipCycle.html

Essentially, clicks trigger 'go to and stop,' bringing users to one of 16 frames. All works as it should at first, but then the whole thing gets really sluggish the more you use it and eventually totally stops working.

New to Animate and wondering A) why that's happening, and B) how I can fix it. Pasting the existing code from one frame below too.

Thanks in advance, all!

code-

var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.LtArrow.on('click', function(){
/*
Moves the playhead to the specified frame label in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
*/
_this.gotoAndStop('St3Rest');
});

var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.RtArrow.on('click', function(){
/*
Moves the playhead to the specified frame label in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
*/
_this.gotoAndStop('St2Rest');
});

var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.StabButton.on('click', function(){
/*
Moves the playhead to the specified frame label in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
*/
_this.gotoAndStop('1Stable');
});

var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.RelButton.on('click', function(){
/*
Moves the playhead to the specified frame label in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
*/
_this.gotoAndStop('1Rel');
});

var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.OverButton.on('click', function(){
/*
Moves the playhead to the specified frame label in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
*/
_this.gotoAndStop('1Over');
});

var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.FireButton.on('click', function(){
/*
Moves the playhead to the specified frame label in the timeline and stops the movie.
Can be used on the main timeline or on movie clip timelines.
*/
_this.gotoAndStop('1Fire');
});