Scripts not loaded all the time

I was using this plugin and it was great cut my load time in half! However then the errors started to roll in. Sometimes it will defer the load of the javascript but then never load it, others times it will load and everything will work properly.

It seems to me like it is timing out on the defer loading, when this happens it breaks my site. Having elements on the site not work is not worth the increase in the speed of the site.

https://ww.wp.xz.cn/plugins/wp-deferred-javascripts/