Hey there!
I’m using Yatse since some days and I really like the app in design, funcionality and the most it’s streaming function, since i use it i got rid of kore.
I have three Raspberry Pi3’s running libreelc (kodi) for my bedroom, livingroom and an optional Rpi3 as a “streamingstation” configured especially for yatse.
The Yatse Remote- and library-functions are working great, I can control all of my media-centers and also my network (LAN) is running great and pretty stable.
I Use Yatse on three different android devices:
Tablet (Android 5.x)
Tablet (Android 7.x)
Smartphone (Android 7.x).
In general, it works good with all of them.
The only issue that i have is when it comes to stream/casting from kodi via Yatse to my 5 Google Home devices (speaker). It connects,- you can hear the “ping” (connecting sound) and i can start streaming/casting like one or two, maybe three files. But when i stop/pause/abort the cast, i can’t go back and i have to restart the Rpi3 to continue streaming/casting.
It say’s something like
“Media not found / Problems finding the UPNP Server / Is the UPNP in Kodi activated? Share UPNP libraries”
“Does this Player supports the media type?”
I’m running 2 Rpi’s with Libreelec Kodi 17.3 and one with 18.0 alpha.
The media is stored on an network attached storage (NAS)
In Addition: The Google Home Group is running fine. I can stream my Android Player (PowerAmp e.g.) pretty good and without any problems.
EDIT: Off course all my UPNP/DLNA settings are set and librarysharing is activated
EDIT2: The issue appears with all devices in any combination. I reinstalled the app, libreelec, kodi, restarted router, nas and all devices included in this thing. 
Maybe there’s a workaround?
Greetings from Germany!
Logs logs and logs.