You should do it at least 2-3 times more. If there's still no disconnections I'd say you're onto something.
I did a run where people talked. Although, ppl did d/c on spawn into the map. Maybe chatting does have something to do with it, but there are still other cases where people have d/ced.
Hopefully the GMs will look more into that, cause I also agree on chatting while bossing might be a contributor to the DC. It might also be the only main contributor actually.
rip but it seems like not chatting in zak runs has been working great for me so far (2 runs without dc now)