Media Player doesn't load videos correctly

Hi to everyone, I have a little problem with my videos. I’m designing an application for 360 Videos. Everything is fine when I upload 4 360 videos but, when I used more than 5 media players the videos takes too long to show in the Level Viewport. I don’t know which is the best way to load the videos. I was using a Playlist to do this. I attached to this post images about my problem. One is the level blueprint the other one shows the number of videos and the problem that the videos never load, and the unique message is “Buffering video”.
Thanks a lot guys for this.

The first screenshot shows the File Media Source

This is the playlist

this one is the problem the videos just buffer

Finally the level blueprint
Like I was saying when I load 4 360 videos the game works fine the videos change without a problem and they are play correctly but when I use more than 5 the videos never load.
Please help me thanks