Black pixels in android build

Hi. Our team have developed a game recently, and we have encountered a problem with android build. As you can see in attachments, on some phones like LG G5, Samsung C7, Samsung J7 there are some black pixels in android build. Notice that there is no object in black pixels position, i.e. the problem is not related to a certain material or texture. But I must mention that textures are compressed as ETC2.
Can anyone tell me whats going on??? Thank you.

Any help please???

did you solve this issue?
Having a similar issue on onePlus 5,+1 similar issue