Cogent Router code updates during height of ecommerce season?

Hello, Over the last several days we have had interruptions at multiple times in our service with Cogent due to them performing router code updates on multiple nodes. I know that some companies put these sorts of updates on hold during the holiday season but I was wondering if anyone has heard of any unannounced security flaws that only larger companies such as Cogent would be privy to? I am certain that if you have heard of these flaws you cannot post the details but a simple yes or no about the existence of such a thing is plenty for me. Happy Holidays Thanks, -Drew