Dear Community, thank you for helping.
I checked the forum and couldn't find a solution for my problem.
I got a JD2 on my Raspian Lite Stretch driven Raspb PI 2 b+
JD2 is in headless mode and I have the following problem:
I set the download and extraction path on a NAS (Fritz NAS).
The download starts, but after a few minutes it stopes giving me the invalid download directory error.
I think its not a problem with rights & restrictions as those .part files of the donwloads started are on the NAS.

If you need logs please tell me which one you need I'll upload them here.

BW
Dom