my j 7 pro only 2 days old some is not working on type. taking to delay may I know why

Hi guys yesterday I was watching a YouTube movie suddenly app get stuck I closed and start again same repeated. i just take camera the cam got black and msg displayed in screen cam isn't responding close now ? may I know why thise happening my pho...

I found my 2 months old j7 max have a problem battery drain fast .I deeply check which app is sucking battery .I found the WhatsApp caches is working in background. so I just delete it one by one my problem is solved .

Did j7 max get airtel volteit's having jio volte