yup, I had the same thing and I really didn't understand it. Two players wanted to surrender from the very beginning, while we were easily winning. (Valeria boss match)
When I refused to surrender, and the fourth guy (beginner with Loath) didn't surrender as well, they threw themselves off the cliff. Only one disconnected once but came back, just to throw himself off the cliff some more.
I kept going and got quite far solo, but with a "survive 120" some mob got me in between.
I really don't understand that behaviour.