I have been suffering from this error for a few months. In the midst of the battle, suddenly a message that says "You were dropped" will pop out and I'll lose that match. It is irritating especially when I'm going to win. This happened to me 10 + times , and it also happens in custom matches. This seriously screwed my Win/Loss. I tried using Lan instead of Wlan and the problem still persists. I searched the forum and i couldn't find any answer. Has any of you had same problems with me?
Read this thread if you haven't done so already. I'm suspecting packet loss, so try pingtest.net and post your results.