I read that but there is something very important missing...
Both the version of the Wanpipe drivers and the version of the kernel is important... They are essentially built against a kernel AFAIK and while they support being used after a kernel with very subtle differences with the help of weak-modules this has pretty big limitations...
Some combinations result in broken Wanpipe drivers because of a mismatch between the Wanpipe drivers and the kernel...
It sounds like it's only with a non-workiing Wanpipe drivers combination that things work for you without further interventions needed like restarting...
All of the Wanpipe drivers published worked for me when paired with the right kernels. Maybe not fully smoothly but as long as I was willing to have them timeout after 4-5 minutes at boot I never had to restart anything...
Good luck and have a nice day!
Nick