[PROBLEM] Not starting after reboot

[japumpy]

First of all, I'd like to thank those involved in the MoOde project for their dedication in their work. Thank you! 

Configuration:

• RPi 3
  
• SMSL M100 DAC
  
• RPi powered independently via a power supply
  
• SMSL DAC powered by RPi
   

From the menu reboot, sometimes the system normally reboots ok and then it doesn't. After which I'm unable to get the system to reboot at all. This issue has occurred on about three occasions now. I've had to start building the system from scratch each time (I've not been able to find how to backup the data/base as yet, if indeed there is a way to do this). 

I have disconnected the DAC from the RPi to see if it's indeed a power supply issue, with the same result. I am not able to ssh either to the RPi. Although I do notice that when I run Advanced IP Scanner, I can see that there is a MoOde device registered on the network.

My apologies if I've not given you enough information, as I'm unsure what else to report at the moment.

Your sage advice is sought.

Many thanks!