OK, here again... my logfiles:
- desktop PC Ubuntu Pastebin - from NAS through UTP cable, runs smoothly, no problem
- RPi3+Libreelec gIQR - from same NAS through same UTP cable, video and sound lags... BUT same media file through USB port runs also smoothly, no problem
???
I was not careful... I will clean all by installing latest Kodi and Libreelec on both hardware.
Later I will attach the new log files...
Sorry, I didn't know having banned repositories. I didn't even know there are banned repositories at all...
Alright, I will install the latest build to both hardware... and I will test again.
What is the next step? 
Thank you for your comment! Alright, here are my logfiles:
- RPi3+Libreelec DgGG
- desktop PC Ubuntu Pastebin
The problem persists...
Libreelec is lagging, PC plays smoothly.
I have played 3 media files on both from the same NAS and the same UTP cable.
Thank you for any help!
I need some help.
My system is the following:
- NAS SYNOLOGY DS212j with 2xWESTERN DIGITAL 6TB Red NAS SATA HDD (WD60EFRX) mirrored
- NAS is UTP connected to Asus RT-AC66U/EEU/13/P_EU router
- router is UTP connected to a desktop PC and an RPi3
- LibreELEC 8.0.2 Kodi 17.3 Krypton runs on both PC and RPi3
The test file (see below) from NAS runs smoothly on PC. The test file also runs smoothly from direct USB connection on RPi3 but it is buffering after some seconds and start lagging in 10-30 seconds later when I try to play it from NAS.
The NAS system he@lth is "good", "DiskStation is working well", the storage usage on 96%, CPU usage during playing 81-97%, RAM on 71%. There was no buffering problem before...
Video about buffering and lagging:
Shared album - Peter Biro - Google Photos
Test file:
Disc Title: Dolby Atmos Demo Disc 2015 Jan. BD25
Disc Size: 5 965 975 776 bytes
Protection: AACS
BD-Java: Yes
BDInfo: 0.5.8
Length: 0:21:28.708 (h:m:s.ms)
Total Bitrate: 31,82 Mbps
VIDEO:
Codec Bitrate Description
----- ------- -----------
MPEG-4 AVC Video 22008 kbps 1080p / 24 fps / 16:9 / High Profile 4.1
AUDIO:
Codec Language Bitrate Description
----- -------- ------- -----------
Dolby TrueHD Audio English 5445 kbps 7.1 / 48 kHz / 5445 kbps / 24-bit (AC3 Embedded: 5.1 / 48 kHz / 640 kbps)
Dolby Digital Plus Audio English 640 kbps 5.1 / 48 kHz / 640 kbps
