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When udev loads the drivers, they are loaded in parallel and race to register themselves with the Zaptel core.  Depending on whatever else is going on in the system, sometimes one driver will register itself before the other one, hence why you only get a failure sometimes.  If you add the drivers to the blacklist, udev won't try to automatically load the drivers on system start, and they will be loaded serially by the  zaptel init script, in the correct order.

Cheers,
Shaun