actually this is what i got back from LL support :
Thank you for getting back to me. Unfortunately, if the basic troubleshooting steps aren't resolving the issue, it is going to be server related as you previously mentioned and it's not something we can address at this level. The reason for this is, our voice servers are handled by Viox, you may need to contact them, because it's their servers
so now we have to solve this ourselves... very disappointing!