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Android app crashes when I enter activity for the 2nd time

Good morning.

I am experiencing a problem with my app. I have an AR view containing a 3D model (static, no animation) and when I launch the activity for the first time everything goes OK.

If I go back to the main menu and try to relaunch the AR activity, depending on the device, the app crashes directly or the 3D model is completely messed up. Furthermore, a Fatal Signal 11 Error is issued.

If I use a different world, not containing 3D objects, all is fine again. I thought of a memory problem triggered by the 3D Model, but debugging the app I see that at least one of the test devices still has plenty of memory to spare.

As a side note, the same folder on iOS shows no problems.

Can you please help?

Thank you,

Paolo