If kodi is crashing on other Linux systems, too, then it'd be best to report it to kodi devs here: https://github.com/xbmc/xbmc/issues - this sounds like it might be a kodi bug.
Yes, with NULL output channels (see post #8) it shouldn't reboot. Maybe a popup with "JACK missing" instead.
However, if official Kodi releases have JACK included, then it's maybe our task to avoid that bug. 
If JACK works, you should see JACK as an output device at Kodi settings. Not sure whether Kodi supports JACK. That's something to ask at Kodi forum.
To my knowledge, nobody has compiled LE with JACK so far. The UMC22 is cheap, so a purchase could save you a lot of time.
PS: I just did a test with my Ubuntu JACK system, and "JACK sink" is available as a Kodi output device.
Yep, install the Kodi Nerds repo. It's a good source of German streaming add-ons. Especially check out the "Joyn" add-on, which is a collection of multiple streaming providers, and was mentioned in the above link.
Interestingly, Zotac proudly claimed the existance of "FREE Media Center OS for your ZBOX mini-PC". I could not find that OpenELEC release, nor how to install it (in simple way). Maybe you could help with that, and I'll try? Ma our
Wrong forum, wrong idea for a broken hardware. 
What's your old username?
I think your PC has a hardware defect, which results in no audio:
Aug 27 07:07:41.913375 LibreELEC kernel: Unstable clock detected, switching default tracing clock to "global"
If you want to keep using the local clock, then add:
"trace_clock=local"
on the kernel command line
Aug 27 07:07:41.913479 LibreELEC kernel: ALSA device list:
Aug 27 07:07:41.913584 LibreELEC kernel: No soundcards found.Don't have it. The only USB thing I had was a Logitech keyboard combo, with the USB dongle plugged in and the keyboard possibly was out of range (in another room).
This USB dongle works, and it's a different USB device:
Aug 27 07:07:41.909466 LibreELEC kernel: usb 6-2: new full-speed USB device number 2 using xhci_hcd
Aug 27 07:07:41.910568 LibreELEC kernel: logitech-djreceiver 0003:046D:C52B.0003: hiddev96,hidraw0: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:01:00.0-2/input2
Aug 27 07:07:41.910732 LibreELEC kernel: input: Logitech K400 as /devices/pci0000:00/0000:00:1c.0/0000:01:00.0/usb6/6-2/6-2:1.2/0003:046D:C52B.0003/0003:046D:400E.0004/input/input5
Aug 27 07:07:41.911690 LibreELEC kernel: logitech-hidpp-device 0003:046D:400E.0004: input,hidraw1: USB HID v1.11 Keyboard [Logitech K400] on usb-0000:01:00.0-2/input2:1
Aug 27 07:07:41.911847 LibreELEC kernel: input: Logitech M570 as /devices/pci0000:00/0000:00:1c.0/0000:01:00.0/usb6/6-2/6-2:1.2/0003:046D:C52B.0003/0003:046D:1028.0005/input/input6
Aug 27 07:07:41.912801 LibreELEC kernel: logitech-hidpp-device 0003:046D:1028.0005: input,hidraw2: USB HID v1.11 Mouse [Logitech M570] on usb-0000:01:00.0-2/input2:2Aug 27 07:07:41.915077 LibreELEC kernel: usb usb1-port2: Cannot enable. Maybe the USB cable is bad?Please try without the USB hub.
We have similar case here: Click! In short: Very few TV's produce a very long CEC initialization time since LE 10+. No solution so far.
I installed LE9 from scratch and all is working wonderfull again.
You have to install LE 10+ from scratch instead.
If you want to build your own LE, open a new thread at Development section. We also have basic Wiki instructions.
No idea, and nobody will do this for you. Easiest workaround: Install Raspberry Pi OS, and autostart Kodi on it. So you'll get JACK.
Hm, why would I need JACK if the thing works fine in ALSA?
The audio interface provides a ton of ins and out, without any standard, how to route them to a speaker system. I guess that's why the ALSA driver only provides an API for JACK. JACK is the expert for connection management.
"aplay" makes an assumption about connections, and that worked. Kodi wants to do it right, and asks the driver for input channels. The answer is NULL (see post #8), because JACK should answer instead.
My Behringer UMC22 has two ins, and two outs. In that case stereo routing is obvious, and that works for Kodi.
We support it, we just have other things to do sometimes. 
2023-02-16 18:11:52.194 T:1375 info <general>: Device 1
2023-02-16 18:11:52.194 T:1375 info <general>: m_deviceName : @:CARD=UMC1820,DEV=0
2023-02-16 18:11:52.194 T:1375 info <general>: m_displayName : UMC1820
2023-02-16 18:11:52.194 T:1375 info <general>: m_displayNameExtra: Analog
2023-02-16 18:11:52.194 T:1375 info <general>: m_deviceType : AE_DEVTYPE_PCM
2023-02-16 18:11:52.194 T:1375 info <general>: m_channels : NULL
2023-02-16 18:11:52.194 T:1375 info <general>: m_sampleRates : 48000
2023-02-16 18:11:52.194 T:1375 info <general>: m_dataFormats : AE_FMT_S24NE3
2023-02-16 18:11:52.194 T:1375 info <general>: m_streamTypes : No passthrough capabilities
2023-02-16 18:11:52.194 T:1375 info <general>: Device 2
2023-02-16 18:11:52.194 T:1375 info <general>: m_deviceName : iec958:CARD=UMC1820,DEV=0
2023-02-16 18:11:52.194 T:1375 info <general>: m_displayName : UMC1820
2023-02-16 18:11:52.194 T:1375 info <general>: m_displayNameExtra: S/PDIF
2023-02-16 18:11:52.194 T:1375 info <general>: m_deviceType : AE_DEVTYPE_IEC958
2023-02-16 18:11:52.194 T:1375 info <general>: m_channels : NULL
2023-02-16 18:11:52.194 T:1375 info <general>: m_sampleRates : 44100,48000,88200,96000
2023-02-16 18:11:52.195 T:1375 info <general>: m_dataFormats : AE_FMT_RAW,AE_FMT_S24NE3
2023-02-16 18:11:52.195 T:1375 info <general>: m_streamTypes : STREAM_TYPE_AC3,STREAM_TYPE_DTSHD_CORE,STREAM_TYPE_DTS_1024,STREAM_TYPE_DTS_2048,STREAM_TYPE_DTS_512Channels are "NULL" for both output options. I think the "aplay" creates two stereo channels, but Kodi tries to use the channels, provided by the audio interface.
"Device 2" has passthrough capabilities. Please try the passthrough option in LE's audio settings.
Tomorrow. But probably everything is exactly the same.
chewitt has just informed me that he found his C2 board. So the log is not necessary anymore.
With that extra C2 board I'm optimistic. 
