I have a dedicated server that runs CentOS 6.3. Every once in a while, in the morning from around 2:00 to 6:00 in my timezone, the server freezes - I'm not sure what happens but it seems all the running processes stop. A Java application that I made kept logs every minute and at that time discontinue. I was able to connect with KVM and found a black screen, from the KVM interface I was able to restart it.
I'm wondering if anyone has any idea on how to investigate the cause of this issue. I'm not really sure what logs to look through and what I would possibly find.
Here's a picture of the bandwidth use:
As you can see, it appears to completely cut out and return when I am able to turn it back on.