VPN VIP+ problem?

Since I subscript VIP+ or username change, have so many problems with VPN.
Yesterday or before yesterday after 3-4hours the VPN just stop working. Today it’s work well after reGenerat key but I receive this error: sitnl_send: rtnl: generic error (-101): Network is unreachable

Someone know why?

And every day I need to regenerate my VPN key, why?