Bridge randomly not showing preview for IPhone Videos(.mov)

Hi,

I'm having some trouble getting Bridge to show preview pictures for Iphone Video(.mov) files.

I have folder with 99 *.mov videos and when I browse to that folder in Bridge it tries to calculate the previews for tose videos, when that is done

- it shows somtimes some of previews,

- the next it show previews of some of the other files and none of the other files it showed before,

- somtimes none of the previews 

- on rare occasions all of the previews.

I found some tips on google for solving missing previews which I tried:

- installing q-lite

- installing k-lite codec

- deleting the cache

- set bridge to use software rendering

- increasing cache size to 400.000

none of that helped.

I thought it might be the amount of videos, so i moved 2 videos to a diffrent folder. But the previews were still not shown in that folder.

I finally tried it in a virtual machine with windows 7 with some of the videos and the previews were all visable there.

I use Bridge 10.0.4.157 on Windows 10 64 bit(1903) on Lenovo L540.

Hopefully you can help me with this problem.

Regards,

Rob