Depends on the setup of the specific KillSwitch / DDNS setup(s) that you've used...
What happened after the Internet connection was restored in this case?
It ran for another day and then cut out again. Upon further investigation I think it is firmware related. I've upgraded to 386.7.1 and it appears more stable so far. Will leave it a few days to ensure it remains stable and then try and finally get this DDNS local access sorted!