I have been receiving lockups running LibreELEC 9.0.0. The video will stop and the the box will reach a load of over 15 for several minutes and then reload kodi. The box is so unresponsive that you cannot even ssh in while this occurring. Never had any issues until 9.0.0.
I see lots of the following:
WARNING: ActiveAE - large audio sync error
CRenderManager::WaitForBuffer - timeout waiting for buffer
CVideoPlayerAudio::Process - stream stalled
Please see attached log files.