"Why do all my sqad mates leave cover and walk towards me when I switch players, even though I'd issued a "HOLD" command? "
God that was the most annoying thing for me! You hit hold so your team stays in place switch to your sniper and then you realize that your entire squad just followed you, walked into the line of fire and that they are all gone!
At that point I decided to trade in the game before it made me throw my PC out the window!