sometimes minimserver is stuck

[simoncn]

This log looks normal. The Lumin app is browsing through the complete contents of the library (this is how it works) and is also sending HEAD requests for the first track of each album. I don't see any log messages showing that any music was playing.

Why do you think MinimServer is stuck? The log shows no evidence of any problem with MinimServer. It is more likely that either the Lumin app or BubbleUPnP Server is getting stuck.