App Flickering on iPhone

Hi Everyone,

I am trying to develop my first App and am using Vuforia with a model target.

I have a script that uses raycast to detect objects.

For a bloom effect that I want to achieve I added the URP (Universal Render Pipeline) addin.

When I test the App directly in Unity on my Macbook everything looks just perfect.

However when I write the App to my IPhone via XCode, the result has some error.

The screen starts flickering in all kind of colors from red, blue, green, yellow.

What I noticed is that if I direct the camera to a "quite" aim like a wall it stops flickering, if i direct it to an area where a lot is going on like in the screenshot it starts flickering heavier, almost like you can see it calculating...

So when I switch off the PostProduction in the (Vuforia)Camera the bug does not appear.

Please have a look at the screenshot attached.

I would be happy for any hint, how to fix this.

I also googled a lot for this bug but didn`t find anything comparable.

Thx, Jonathan