Hack ?

I've been experiencing loosing my team mates sight for a second and suddenly i get attacked by these players that show up out of the blue with all head shots. Sometimes after I die I notice something peculiar; the team mates calling cards on the opposing player that killed me are not visible. Reason enough to believe that the hack is to see my ping location by acting like they are my team mates and replacing my original team mates; it happens so quick i could barely notice it...

A lot of team mates are idle and useless; making me  suspect that they troy our team by giving out our location... Could we bring solo open world matches into play ? it seems that other team mates just get me in trouble...