Final post from me on this topic today:
Just ran a 25.3 minute session on the websocket option, with none of these sudden client exits.
Conclusive? Not at all, but being the first of 4 sessions in a row not showing the specific error behaviour during the first 20 minutes it is food for thought.
This time however, i logged out simply because i became too sweaty 
All 4 sessions were low level warrior grinding, and i’m not exactly in shape
Regardless, this may give you some clues to go by.