My device freezes while playing pubg

I have noticed several time while playing pubg if i minimise my game in between n open whatsapp then my whole device freezes like hell and it become very difficult to get back..Please help
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I am also facing the same issue.
Any help?
Does this issue only occur when jumping between PUBG and WhatsApp, or other apps as well?
Nope, currently facing this issue while switching b/w pubg n whatsapp.And trust me sir,if anyone calls me on whatsapp in between pubg gameplay,then both pubgs and whatsapp call hang like hell and i have to restart my device as a result it ruins my GamePlay 😭