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HTML

              
                <div id="app">
  <svg width="470px" height="373px" viewBox="0 0 470 373" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <g id="Artboard" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <rect id="1" fill="#FF0303" fill-rule="nonzero" x="58" y="10" width="50" height="50"></rect>
        <rect id="2" fill="#FF0303" fill-rule="nonzero" x="134" y="10" width="50" height="50"></rect>
        <rect id="3" fill="#FF0303" fill-rule="nonzero" x="210" y="10" width="50" height="50"></rect>
        <rect id="4" fill="#FF0303" fill-rule="nonzero" x="286" y="10" width="50" height="50"></rect>
        <rect id="5" fill="#FF0303" fill-rule="nonzero" x="362" y="10" width="50" height="50"></rect>
        <rect id="6" fill="#FF0303" fill-rule="nonzero" x="58" y="86" width="50" height="50"></rect>
        <rect id="7" fill="#FF0303" fill-rule="nonzero" x="134" y="86" width="50" height="50"></rect>
        <rect id="8" fill="#FF0303" fill-rule="nonzero" x="210" y="86" width="50" height="50"></rect>
        <rect id="9" fill="#FF0303" fill-rule="nonzero" x="286" y="86" width="50" height="50"></rect>
        <rect id="10" fill="#FF0303" fill-rule="nonzero" x="362" y="86" width="50" height="50"></rect>
        <rect id="11" fill="#FF0303" fill-rule="nonzero" x="58" y="162" width="50" height="50"></rect>
        <rect id="12" fill="#FF0303" fill-rule="nonzero" x="134" y="162" width="50" height="50"></rect>
        <rect id="13" fill="#FF0303" fill-rule="nonzero" x="210" y="162" width="50" height="50"></rect>
        <rect id="14" fill="#FF0303" fill-rule="nonzero" x="286" y="162" width="50" height="50"></rect>
        <rect id="15" fill="#FF0303" fill-rule="nonzero" x="362" y="162" width="50" height="50"></rect>
        <rect id="16" fill="#FF0303" fill-rule="nonzero" x="58" y="238" width="50" height="50"></rect>
        <rect id="17" fill="#FF0303" fill-rule="nonzero" x="134" y="238" width="50" height="50"></rect>
        <rect id="18" fill="#FF0303" fill-rule="nonzero" x="210" y="238" width="50" height="50"></rect>
        <rect id="19" fill="#FF0303" fill-rule="nonzero" x="286" y="238" width="50" height="50"></rect>
        <rect id="20" fill="#FF0303" fill-rule="nonzero" x="362" y="238" width="50" height="50"></rect>
        <rect id="21" fill="#FF0303" fill-rule="nonzero" x="58" y="314" width="50" height="50"></rect>
        <rect id="22" fill="#FF0303" fill-rule="nonzero" x="134" y="314" width="50" height="50"></rect>
        <rect id="23" fill="#FF0303" fill-rule="nonzero" x="210" y="314" width="50" height="50"></rect>
        <rect id="24" fill="#FF0303" fill-rule="nonzero" x="286" y="314" width="50" height="50"></rect>
        <rect id="25" fill="#FF0303" fill-rule="nonzero" x="362" y="314" width="50" height="50"></rect>
    </g>
</svg>
</div>

              
            
!

CSS

              
                
              
            
!

JS

              
                new Vue({
  el: "#app",

  data() {
    return {
      minDelay: 0.3,
      maxDelay: 6, // 6 seconds
      timelines: [],
      // numberOfTransactions: 5 // this does not need to be reactive, does it?
    };
  },
  
  methods: {
      randomIntervalTime() {
      const maxTime = this.maxDelay;
      const minTime = this.minDelay;
      const randomTime = (
        Math.random() * (maxTime - minTime) +
        minTime
      ).toFixed(2);
      return randomTime;
    },
    randomiseLocations() {
      /*
        We already have allItems stored,
        no need to traverse the DOM all the time.
      */
      // return document.getElementById(
      //   Math.floor(Math.random() * Math.floor(25))
      // );
      
      let index = Math.floor(Math.random() * Math.floor(this.allItems.length));
      let trg = this.allItems[index];
      
      if(TweenMax.isTweening(trg)) {
        console.log('it is tweening, check again', index);
        return this.randomiseLocations();
      } else {
        console.log('not tweening', index);
        return trg;
      }
    },
    tweenItem() {
      // console.count('setup tweenItem');
      /*
        What you need to pay attention to is whether you are trying to animate a target that's already animating.
        From what I see in your setup here, you do not want to override an already
        tweening element, it can cause the box to not end up back on its original colour
      */
      const vm = this;
      TweenMax.delayedCall(this.randomIntervalTime(), function() {  
        // Having your delay inside the tween was problematic and was leading to false negatives when checking to see if the object had a tween attached to it.
        let randomTrg = vm.randomiseLocations();
        TweenMax.to(
          randomTrg,
          1, {
            repeat: 1,
            yoyo: true,
            fill: "#7897D3",
            onStart: function() {
              console.log('start tweenItem', Number(randomTrg.id) - 1);
            },
            onComplete: function() {
              console.log('completed', Number(randomTrg.id) - 1);
              vm.tweenItem();
            },
            ease:Power1.easeInOut,
            scale: 0.5,
            transformOrigin: 'center center'
          }
        );
      })
    },
  },

  mounted() {
    // you can count how many children in your "board" programatically, rather than have it as a data() attribute
    this.allItems = this.$el.querySelectorAll('rect');
    this.numberOfTransactions = 5;
    
    for (let i = 0; i < this.numberOfTransactions; i++) {
      this.tweenItem();
    }
  },
  beforeDestroy() {
    // stop any tweens that might be playing
    for(let i = 0; i < this.allItems.length; i++) {
      const target = this.allItems[i];
      TweenMax.killTweensOf(target);
    }
  }
});

              
            
!
999px

Console