RPI3B+ lagging wired playback

Hello

I’ve a RaspberryPi 3 B+ with up-to-date osmc. My movies are in an NFS share. When I start to play them, after a while, the Pi starts lagging, buffering. When I switch from wired network to wireless, the problem is gone. With the previous RPi3 everything went fine. The problem comes only with 1080p movies.

Is it a “driver” problem?

Is your router / switch Gigabit?
Some users have problems with the new Pi’s Gigabit speeds

Yes, it’s a gigabit switch. I think that is my problem also.
Is there a support thread for it?
I haven’t found anything in the osmc forums

See Samba works fine on startup then becomes sloooow / unstable - #6 by pho08