Hi,
Gave the note 8 to Samsung service center to Airlink warranty claim , they fixed my device in 1 day , and got the device back right now in my hand . Device seems to be not opened, means I think it was software crack somewhere. Because my device have itnstalled 360 glass protector and it didn't removed or seems to be re applied, it means device didn't opened in Samsung services center, they fixed it through software I believe. Thank God mine is get fixed without any major issue . If you guys have Samsung warranty then you should go to service center ... If any one didn't have Samsung warranty and facing this type of problem.... better install factory stock firmware in it .. thank you and Good Luck