Sabotage What's up?

Recently,
I don’t know what going on, but I am 0/7 today on sabotage on normal mode with 5 random dude.
It’s always at the same area on wave 3 that doesnt seem plausible for a “normal” mode…

I mean enemis on 3 different level ground, you need to cover to much area and mob shoot from every and to far range.

on release, I was 2/2, and not 0/7;

Any tips or strat or something ?.. it still only normal mode with pug… shouldnt be that complicated.