Diablo II Your connection has been temporarily restricted from this realm. Please try to log in at another time

I keep getting disconnected and my connection is temporarily interrupted for 5 through 20 mins. I am not joining the games fast or switching characters too quickly. It just seems to disconnect me after playing for a few mins on any character. I have already referenced the guide listed here https://us.battle.net/support/en/article/119708 .
Anyone know what may be causing this issue?