NOT JUST SKYPE... VONAGE FALTERING

I posted last week about my friend telling how Skype's paid service was faltering. Now's it's Vonage too. I was talking with a friend who uses Vonage just now and the call was going in and out and he had to call me back, but it still didn't get any better so we hung up. I wonder if for Vonage this was an isolated incident or an indication that its quality of service is being affect by its growth?