Videos not always loading

I have brought the full version of this slider and im having a few problems with the YouTube videos.

The videos are always the first slides in my sliders and i have 4 sliders in total on various pages. The video sliders are YouTube urls. The videos do not always display, around 50% of the time a white space appears instead of the video, when i hit the refresh button the videos always load. You can always navigate to the image slides that come after the video but around 50% of the time the first YouTube slide in the slider will be a blank white space until you hit the refresh button.

Has anyone come across this before or have a fix for this bug?

Many Thanks

https://ww.wp.xz.cn/plugins/slider-image/