Plex Media Server crashing

Hi,
my plex server on my MacBook pro retina keep crashing while I stream from it to my Apple tv.
After 12 minutes of streaming it will just crash along with the system.
Plex Server Version 0.9.16.6.1993-5089475 OsX 10.11.6 (15G12a)
I stress tested both the CPU and the GPU without any result