Question Flickering semi-transparent UI elements in Editor

Hi there, thanks for reading.

Issue: Semi-transparent UI elements on my 2D mobile game flicker repeatedly in the Unity Editor and in Play Mode. There is NO issue when building to Android or iOS; this ONLY happens in the Editor. It does not affect any part of the Editor or any other component in the project; it ONLY affects these semi-transparent UI elements. They are basic 1x1 sprites (Texture2D) being stretched across the screen to produce semi-transparent black backgrounds for other UI elements.

For flickering elements that are more transparent than they are opaque, they flicker by disappearing. For flickering elements that are more opaque than they are transparent, they flicker by becoming entirely opaque. It seems like the transparent backgrounds momentarily flicker by turning entirely transparent OR by becoming entirely opaque.

Video of it happening (note the top and bottom bars on first screen, parts of second screen):

I have only one camera in the entire project:


Example object that flickers:


The texture:


Any ideas?? I have played with Nvidia settings on GPU (excluding Unity Editor from gSync), tried playing with camera clipping planes, z values for the UI elements, etc. I will take any advice or ideas at all, as this makes capturing the game for promotional videos impossible with the flickering.

Thanks in advance! I'll respond to every reply.