Problem with Random Files

I have the following problem:

I create at the same time 10 different files as "Random Files" with the same genre.

In my playlist i want to play every hour one file of this randomly.

So the best would be, if MB Radio plays first only files that was not on air before. In my example the next 10 hours it should be always a different file.

But MB radio plays every hour the same file and no file that was not on air before.

Is this maybe a problem in the version 8.61.3.0 ??

OK, I send you the debug

Thanks