Hello JoeRed82,
I set up a sound cue similar to what you are doing and understand what you are hearing. Firstly change your max concurrent play count to like 32 or something higher than 1. What you are hearing is the “Random” node waits for each sound node to finish playing before choosing another one to play. If your sounds slowly fade, or if they have extra space at the end this is what is happening.
I have set up another way for you to customize your sounds to get rid of the delay so there is always a sound playing being mixed in randomly with the others. This way you have a consistent loop with sounds you have in your cue always playing. This also gives you more control within your Random node to add more weights to sounds you would like to always have playing versus mixing in others as well (which I am assuming you are attempting to achieve with fire).
Random Sounds Using Mixer Node
I hope this helps!