Projection sides getting darker?

Initially the projector’s output was clean and mostly uniform but lately, I’ve noticed that when the screen is completely blank it shows much darker regions on the sides and perhaps it’s just the perceived effect, but they seem to be widening. I design for a living so if this was as bad in the beginning, I would have definitely noticed something was off.

The photo was taken on a mirrorless camera, not a mobile phone.

A post was merged into an existing topic: Light output uniformity across projected image