Bugs aside, AI is currently too much to deal with. I get it, you probably did it for balance, but is really uninteresting to be fighting AI. Right now they spawn too often too much, activate alarms immediately and move fast. Is the implementation of everything that really breaks things. If you are gonna make alarms so slow to disable, then have AI not trigger them instantaneously. If you are gonna have AI spawn so much and move so fast, then make them not activate alarms so fast.
If you plan to keep AI as it is, then buff predator HP to the roof and remove/change all damage buffing passives/specializations/perks for Predator and FireTeam.
Also nerf the Saw-Z once and for all. That weapon is a problem to deal with and the moment players stop using it all of a sudden matches become more interesting.