One of my devices is showing 'Offline.' Tried rebooting but no joy. How do I begin troubleshooting?

Project help balenaSound
1

I haven’t made any configuration changes. Successfully streamed music using that device earlier this week, but today it’s showing ‘Offline.’ I can see both its MAC and IP on the network. Where to start?

Edit: Logs available here: https://www.dropbox.com/s/as5icbg2jilt6l0/balena-sound_back%20porch-14.03.21_08%2038%2038_(-0400).txt?dl=1

Edit: Issued these commands from the other working device:

root@22447d3:~# nmcli device status
DEVICE           TYPE      STATE      CONNECTION         
eth0             ethernet  connected  Wired connection 1 
wlan0            wifi      connected  resin-wifi-01      
supervisor0      bridge    connected  supervisor0        
balena0          bridge    unmanaged  --                 
br-29a3e4988a02  bridge    unmanaged  --                 
resin-dns        bridge    unmanaged  --                 
veth10918e6      ethernet  unmanaged  --                 
vethdf9f9ea      ethernet  unmanaged  --                 
vethf141fb8      ethernet  unmanaged  --                 
lo               loopback  unmanaged  --                 
resin-vpn        tun       unmanaged  --  

root@22447d3:~# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel qlen 1000
    link/ether b8:27:eb:44:96:ab brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel qlen 1000
    link/ether b8:27:eb:11:c3:fe brd ff:ff:ff:ff:ff:ff
4: resin-dns: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue qlen 1000
    link/ether 42:88:a7:30:8d:d9 brd ff:ff:ff:ff:ff:ff
5: supervisor0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue 
    link/ether 02:42:5f:87:8c:7e brd ff:ff:ff:ff:ff:ff
6: balena0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue 
    link/ether 02:42:87:42:b6:3b brd ff:ff:ff:ff:ff:ff
7: br-29a3e4988a02: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue 
    link/ether 02:42:ab:c3:64:37 brd ff:ff:ff:ff:ff:ff
10: vethdf9f9ea@if9: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue master br-29a3e4988a02 
    link/ether 76:f5:05:e0:c0:27 brd ff:ff:ff:ff:ff:ff
12: vethf141fb8@if11: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue master br-29a3e4988a02 
    link/ether 62:54:bb:f1:f9:04 brd ff:ff:ff:ff:ff:ff
14: veth10918e6@if13: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue master br-29a3e4988a02 
    link/ether 32:43:42:da:4c:e1 brd ff:ff:ff:ff:ff:ff
17: resin-vpn: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel qlen 100
    link/[65534]
4

Having similar issue.
I have 2 devices (IPCs) that run OK for some time (less than a day), but then became offline on balenaCloud dashboard.
I have keyboard and monitor connected, but nothing appeared in the screen, not possible to open a terminal. Just balena logo is displayed.
After reboot it seems to work for some time, but then again goes offline.
Also, when I disconnect the network cable and reconnect, I noticed that connection recovery takes long time, minutes. When a regular OS like Ubuntu is running, the network connection recovers within way less than a minute.
I guess would be good to open a terminal using the monitor and keyboard connected to the device and see some log files right there,
Some time ago after pressing on Delete key, it was shown the terminal with a login prompt, but I was not able to login to it,