Videos pause after a few seconds
I have a problem playing videos taken with my GoPro (Hero 5 Black) 1080@50fps. All videos play for a couple of seconds and then there is a pause between 5 and 30 seconds before the video continues to play. Very annoying. Im using latest version RasPlex on my RPi3 and the server runs at a Synology NAS 216Play. I have also installed a server on my PC to see if that helps but the issue is still there. Videos taken with an older video camera (also HD but 25fps) plays without a problem.
The only thing I can think of is that there is some kind of buffering going on but are there any settings I could apply to fix this? All equipment is connected by wire and I have an Apple Airport Extreme as router and a 12 port NetGear switch in between as well. I have no issues streaming any type of content to my TV like netflix etc.