My son had the same issue, if you are good at crucible there will be people reporting you for anything. I think every match there are players who don't take damage (usually top of leader board) it's not the individuals fault, but how destiny servers work. But people blame connections where generally most people have sufficient connection these days. It's pretty poor they won't tell you why though.
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There are people who purposely manipulate their connection and then those who are genuinely good, the latter being a very tiny minority. I really don’t care what the leaderboard looks like at the end of the match. I’ll report anyone who did anything questionable and let bungie sort it out.