Quote Originally Posted by Memooselah View Post
Has anybody else ecountered this?
Yes, I have - when grouping with others (I only 2-box). When you zone in you see a message like "Enemy reinforcements arriving!" or something. That is because the zone changes when you have 3/4 in your group. It's designed this way to make full groups have to work just as hard as 1/2 man groups.

As for boxing them, your best bet is to get another level or two. I usually save all Heroic 4s for the end of a planet, when I'm done with other quests. Sometimes the Heroic has gone grey, but not always. It's much easier then. Levels really matter in this game.