I've noticed something strange happen, which has happened to me multiple times in the maps Refinery and hideout.
The areas it has happened are:
Refinery: The defenders' far left entrance of alpha, behind the sandbags looking outside (2+ times); prone next to the concrete barriers on the defenders' far right side at bravo just in front of the garage/storage building entrance (1 time)
Hideout: 2nd floor defenders' left side of the objective building while looking down the staircase (2 times)
Pattern of occurrence:
When I'm standing still in a single spot and (usually) indoors looking at a well lit, brighter area.
The screen progressively gets darker until it reaches a point that it's difficult to see almost anything.
What's strange is that if this was a built in mechanic simulating the adjustment to the dark or something, that looking outside or at a bright light would make it appear brighter; but it's exactly the opposite. Which makes me think it's some sort of glitch. This started happening to me after the most recent update.