Mine it's set to 1080p-50hz and auto switch is off.
What can I do ? If I'm not mistaken that strange resolution wasn't on Android 6 MM. After 10 second of "finding" the correct resolution it works great.
It's not the projector. With Apple TV 4 I don't have that problem.
2400x1080 is a very weird resolution, probably not supported by your projector.