No sound on some files

[valib]

There is a lot of errors in the log. Please try to make the clean instalation of the UMS.

[Nadahar]

DEBUG 2019-02-22 20:03:46.720 [HTTPv2 Request Worker 5] net.pms.network.RequestHandlerV2 Connection error: java.io.IOException: An existing connection was forcibly closed by the remote host

That particular error is quite common and simply means that a renderer closed one of the HTTP connections it had to UMS without saying "proper goodbye". That happens all the time, for example if UMS gives a reply that the renderer doesn't expect or understand, or when you abort a playback from the renderer or turns it off etc.