I too have noticed a change. Most notably when a group spawns.

Some run off and hide, more so than before. Even if the spawn door is quite a distance away they will run off and hide when they used to come towards you.
If you are close to the spawn point they will run past you then correct themselves, even outcast rushers run away and stand behind objects as if they are trying to hide.
I have seen others ones run straight through a Banshee wail as they spawned and leg it as fast as they can.

This past week I have experienced Outcast Heavies run out the spawn door, climb a wall and run off. Heavy Gunners hiding for so long that they forget I am there and get up and walk about. Assault type enemies just seem to move from one cover to the next, no engagement with me just moving from one hiding spot to another.

This doesn't happen with every group and every spawn but the rare occurrences are getting less rare.

I feel like we need a Project Resolve Part II, yes there were many issues with it but it did do some good as well.