Do you having monitoring setup on your cloud vm, because you should have alerts triggering emails to notify you when this is happening.

Secondly, you are using an IP address and expecting that to be static? The recommended approach is to use a CNAME so you don't hit that issue, alternatively, you can have up to 5 Reserved-IPs per subscription and attach that Reserved-IP to your VM : New-AzureReservedIP from powershell

Edit : see http://azure.microsoft.com/blog/2014/05/14/reserved-ip-addre...