Still buzzing red like there are infestation mobs left, but I've never seen that before after killing the final boss,
Hi there,
Thank you for bringing this issue to our attention. If at all possible, please press F2 while in-game and attach a screenshot of the overlay menu to this post so we can better understand what maybe causing the issue.
Thank you!
Work Around: Ate a number of explosive satchels, cleared on respawn.