Abnormal Disconnect - Unable to log in on a singel chracter - others in same league work fine

One of my characters in Secrets of the Atlas is frequently unable to log in. I start the game client, log in with my account, go to the character select screen, and attempt to log in. I immediately get an "Abnormal Disconnect -- Failed to log in" error.

I am able to successfully log in with other characters in Secrets and in Standard. Sometimes logging in with another character then restarting the client will correct the issue and let me log in on the character I want to play. Other times I just have to wait. Earlier today I failed to log in over a dozen times in a row. After waiting 10 minutes I was able to log in.

This is occurring more and more frequently. The only character it seems to affect is my Necromancer named "GrimzEcho"