Make Sniper/Minigun/Nade sentries stop aggroing enemies they cannot shoot. I sometimes encounter this problem when I put sniper sentries high above the ground and right below a ceiling, where enemies can walk on the ceiling. The sniper sentries stop shooting and only start shooting once the enemies on the ceiling are killed because they are closer to the sentries.
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Durtle was messing around with this a month ago on discord:
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