Now you see why I am so insistent about testing things multiple times, under different conditions... 
There seems to be quite a few things involved in having this works correctly consistently...
In my case I think timing might be in for some things, in yours I guess we should
See "systemctl status dahdi.service" and "journalctl -xe" for details.
to see if there is anything we can do about your new problem...
Good luck and have a nice day!
Nick