Just took a HS mission... As soon as I got to the sector and the bots spawned, all of the Collectors headed for the nearest roid to mine. Then they flew to the center of that roid and sat there, invincible... :-(

Yea i noticed that too.

Sometimes their engine stuck out and I could shoot it.

I haven't been able to catch this happening. You say all the collectors in an HS did so? Did you do other HSes where they didn't? Do you remember what sector it was?

I figured it out. It's a complicated problem.