Kodi stops playback after a couple of minutes

hey
one of my (external) Kodi clients has playback problems since a couple of weeks.
Playback starts fine, but after some minutes it freezes.
Client is a Raspberry Pi 3 with Libreelec.
Any idea how to find out what’s causing the problem?
The only strange things in server log are these lines:

Quote:2016-09-12 16:22:57.8739 Error HttpServer: Error in SharpWebSocket: An exception has occurred while receiving a message.. Exception.Message: The header part of a frame cannot be read from the data source.
2016-09-12 16:22:58.0255 Error HttpServer: Error in SharpWebSocket: Sending a data has been interrupted.
2016-09-12 16:22:58.0255 Error HttpServer: Error in SharpWebSocket: The WebSocket connection has already been closed

Already tried a fresh install of the Emby for Kodi plugin.
Everything ran smooth the last months before the problem occured.
I’m beginning to think that this is a hardware issue of the rp3.