I think its a hardware issue. I am a PC Gamer and have some knowledge about gaming devices. M Playing BGMI in iPhone 7+ and iPhone XR without any issue. I use old Samsung A7 6Gb Ram 128 GB Storage in same game without any issue. But a fully gaming compatible phone for Gaming with 90fps is facing issues like that. I checked all reviews about this phone before buying. Others device are working gook only M facing same issue. Service center people only checks sensitivity testing and gives it back coz you wont get any problem in testing. Can you help sir pls!!!!!!!