[SOLVED] RPi3A+ Network instability.

[the_bertrum]

So, a few more tests and a bit more information.
I've checked the files in /etc/NetworkManager/system-connections/ on moOde 9 and a vanilla RaspiOS, there are subtle differences:

Code:

network config moOde9.
master@prometheus:/etc/NetworkManager/system-connections $ sudo cat TeawithRuby.nmconnection
#########################################
# This file is managed by moOde          
# Wireless: Configured SSID              
#########################################

[connection]
id=TeawithRuby
uuid=3919fc65-ccc0-4c70-a814-e10cd355d633
type=wifi
interface-name=wlan0
autoconnect=true
autoconnect-priority=100
[wifi]
mode=infrastructure
ssid=TeawithRuby
hidden=false
[wifi-security]
key-mgmt=wpa-psk
psk=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[ipv4]
method=auto
[ipv6]
addr-gen-mode=default
method=auto

Code:

RaspiOS network config:
master@prometheus:/etc/NetworkManager/system-connections $ sudo cat preconfigured.nmconnection
[connection]
id=preconfigured
uuid=4734a9c2-4806-4c25-8a8a-323bdd1d90b3
type=wifi
[wifi]
mode=infrastructure
ssid=TeawithRuby
hidden=false
[ipv4]
method=auto
[ipv6]
addr-gen-mode=default
method=auto
[proxy]
[wifi-security]
key-mgmt=wpa-psk
psk=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

I copied the lines from type=wifi onwards into a moode 9 config file and got the same behaviour with the freeze.

So I did a fresh burn of moode 9.0.2 and put it in the Pi3A+ with no HAT or other stuff, left it out of the case and near the router.  Minimal config of network (pre-configured in the Imager), then the legacy mode so I could play stuff to the headphone socket without ALSA complaining there wasn't actually a device.  I played radio streams for a few hours with no issues, even swapping rapidly from one to another to another didn't cause issues.
Next I added the SMB share for my library and kicked off a scan.  Now I can get a freeze by doing stuff while the scan is running (swapping radio stations a few times will reliably kill it).  Wipe it and start again and kick off another scan but leave it alone while it scans and I find that the scan gets to the end (mpd log shows the last file has been processed) but the system is frozen and library doesn't load into the UI.  Reboot and there is no evidence that mpd scan ran at all.

So, maybe not network after all, but mpd?

I can definitely cause the freeze at will by running a scan then playing a radio stream or two.