@NinjaCode 

I don't know if there is the same problem with you But I know some of the routers have got fix for this error
Fixed the Issue of Internet Down When There Is A "-" Symbol in Open VPN Name.

So if you have OpenVPN tunnels with - then try to change these

I see ER7206V2 also got fix for this

Bug Fixed:

1. Fixed the issue of internet down when there are special symbols in open vpn name.