OpenVZ containers losing their IPv6 connectivity
I have OpenVZ services with two providers which I consider proficient. Inception Hosting uses SolusVM while AlphaVPS has a panel integrated into WHMCS but I suspect it's SolusVM in the background as well.
My services with both providers started showing IPv6 issues recently: I can still ping their default gateway from my VM but don't get any further. I don't see any incoming traffic in my VM and when I try to ping it from outside, I get
Destination unreachable: Address unreachable from their gateway IP.
Pressing "Reconfigure networking" in SolusVM restores connectivity for a minute or so until it drops again. I have opened tickets with both providers several days ago but they seem to be unable to resolve it.
Has anyone seen (and solved) similar issues before and could provide some information which may help the providers to get this sorted? Could this be just another weird SolusVM issue?