4K buffer underrun (wired ethernet NFS with fstab)

Running defaults settings with latest Leia alpha release. Kodi is reportin source is too slow, every 10 or so minutes it starts to stutter/buffer or pause to buffer.

Format : Matroska
Format version : Version 4 / Version 2
File size : 53.7 GiB
Duration : 1 h 55 min
Overall bit rate : 66.2 Mb/s
Movie name : The Post 4K
Encoded date : UTC 2018-04-14 22:33:47
Writing application : mkvmerge v22.0.0 (‘At The End Of The World’) 64-bit
Writing library : libebml v1.3.5 + libmatroska v1.4.8
Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Commercial name : HDR10
Format profile : Main 10@L5.1@High
Codec ID : V_MPEGH/ISO/HEVC
Duration : 1 h 55 min
Bit rate : 61.6 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.310
Kodi reports source is too slow.

Stream size : 49.9 GiB (93%)
Writing library : ATEME Titan File 3.8.13 (4.8.13.0)
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0050 cd/m2, max: 1000 cd/m2

Does this occur with Krypton?

Leia is still very much a work in progress

Sam