Grains on screen

Unity Engine
1

I ported game from iOs to android and when I build and run the game works good, bt when I close the game and open it again , i see a lot of grains on the screens. Is it to do anythign related quality settings/ compression or anything else?
Please help me with correcting this issue.

Thanks,
V.Lakshminarayanan

2

Hard to tell. Could you possibly post a screenshot first?

3

Could be texture compression. Could be screen bit depth.