I have noticed an increased intensity of these enemies for some time in the game. On the Mortis trials there are whole waves of them that can annihilate an entire team. It's only been in the last month/two months that I feel like they are a problem for me, especially on the Mortis trials - there are just too many of them to avoid them. I have the impression that Fashark is going for the easy way. Enemies at higher levels are not harder or smarter. They just throw more trappers, mutants and poxbursters.