[SOLVED] RPi3A+ Network instability.

[Tim Curtis]

Running a full update with htop running to see what happens.  Attached a screenshot taken from the frozen system.  Top window is the mpd log, the track being scanned is irrelevant, it doesn't fail on the same track each time.  The top process is nmap, that's interesting given the network oddness that goes with the freeze (network operations never timing out or failing , but also never completing either).

Nmap is used in a couple of places to scan the network on-demand for example
- Discover receivers 
- Players >>
- Scan for NFS shares

Its also used in the Mount Monitor to scan for NFS shares.

Try turning off Mount Monitor and also for good measure set Monitor to No for any Radio Stations that are being monitored. The station monitor follows the end of the mpd log for "alsa_output: Decoder is too slow; playing silence to avoid xrun" messages and then restarts MPD if there are more than a [threshold] number of them.

Another thing to do would be to set MPD logging to Verbose and also turn on moode debug logging. This would be to see if any of the extra detail in the logs has some clues to what might be happening.