There is something wrong with DH class and pet battle that cause DC as soon as i start.
With or without addons, i get DC only on my DH.
I have the same issue, I didn’t even notice that it’s always on my DHs, I thought it’s just random
I start pet battle, I dc, and when I logg back in and try again the fight works as it should
Thanks for the reports. It’s being looked into, but for now it seems to behave better if you aren’t mounted when you go to start the Battle 
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This explains why my 2nd try always works, because of course I’m not mounted anymore then 