The only time I saw something suspicious was when I was downed, had a knockdown shield, but was killed in a single shot from the front despite being at full knockdown health and having said shield up.
Another time, I was downed and, for some reason, still holding my weapon, so I shot the guy who downed me. He might think I was hacking or something, but it was just a weird bug. After my friends revived me, I could no longer switch weapons and if I picked an upgrade up, my weapon disappeared entirely, rendering me unable to shoot, reload or anything. Using my Q would bring my weapon back until the next time I picked something up. Odd stuff.
