It isnt something local on my side. I play with people from all over my country I have 20-25 ping on a 1000/100 mbit connection and whenever I have the symbol flashing on my screen, 100% of times, my team mates also have it.
"A prediction error icon is the one with two parallel lines with dots on them. This indicates that the server has failed to predict the movement of another player, generally one you’re looking at. The game tries to calculate and predict such behaviors to a certain extent to show them to other players faster, but a prediction error shows that these predictions are wrong. This is also a server-side problem that you generally can’t do anything about. "
