I did some tests with old mobile phone using Android 7.1 and may game freeze and stop respond many times.
In the log have many rows with the following errors :
SurfaceView - ...MainActivity] dequeueBuffer : BufferQueue has no connected producer
void _egl_paltform_dequeue_buffer(egl_surface*):1618 : failed to dequeue buffer from native window(0x4c3d7008); err = -19 , buf = 0x0 , max_allowed_dequeued_buffer 3
I will try again with different phone / or tablet/ , but is it possible to set some settings in project.xml to optimize ( to use GPU at example, if not) for old phones ?
On the new phone ( with Android 9) everything works perfectly.