Caiv was restacking every round. Never lagged or went Away. Then this happened:

Caiv's turn
neutral defeated 8v3, 36 to 7, (2,6,1,5,6,4,6,6 to 4,1,2)
(-3 for 4th and -18 for dominance)
Rank: 779th Score: -21 to 485◆.
Caiv finishes 4th (forced resign) in round 15

He attacked a neutral, won the attack and got flagged out.

FWIW, the previous 3-5 rounds he'd been stacking, but not attacking.