Video Stopping mid-ways

[Crytek18]

Hello!

I am currently having a small issue with some of my videos, and I hope I can get some help here.
Sorry if It's the wrong area to post this kind of question.

I'm having a few Videos. ( mp4 ) trying to play them with the newest updated VLC player.

Now on the bottom of the VLC screen, it tells me the Video is 22:14 mins / sec long, but the Video just stops after around the half~ so 10:07
If I let VLC play the whole video, it stopps at the 10:07 mark, and goes black like the video is finished, even the progress bar on the botton just reached half of it,
Now but when I click manually into the time bar, and choose a point over the 10:07 mark, the video still plays, but the time on the bottom stops counting and I cant hear any sound anymore.
Over 20 videos are affected by that currently so Im really looking to fix it.

Would appreciate any help.
Btw : My System is strong enough to run the videos, so that won't be it.