You will get someone in your sights, line em up, pull the trigger gun will start to fire then all of a sudden for no reason you will do a melee mid firefight and then usually end up dead.
Its frustrating as its very random. I've noticed it doesn't happen when you unlock a new gun for a while (or perhaps just coincidence?) then it starts happening. Is it when you add certain attachments?
I've tested three controllers out, tested shooting without my thumb being anywhere near the right thumb stick and it still happens.
I know others have what they might see as "bigger issues" but I don't suffer lag, most games are great fun and I really like the game. But this "bug" or whatever it is, is beginning to annoy me more and more. And I've seen it happen to lots of people I'm playing against to, they'll have me cornered be firing I'm about to drop and they'll suddenly melee and I'll kill them. Then you hear the swearing in frustration.
Please, please fix this!