Thanks,I tried all those including checking to see if it was the battery,not using smart switch to use on note 8 from s8,not the power button,soft reset,safe mode,and last but not least,hard reset.when I did the reset,is what really confused cause it started acting crazy,restarting continuously restarting like never before n it just stopped n haven't did it since,smh.im out of options,I'm starting to feel like it's my worst fear which,its a firmware issue which I'm on my own cause bought phone outright.i really love my note 8 n dnt want to give up on it but when it does the restarting n relooping,it could take me up to an hour repowering n repowering before it stops.Some bi-polar type ****.ive never experienced anything close to this n all my life of being a galaxy owner,of all the galaxies but 1,n 4.smh! Why couldn't it be one of those simple solutions mentioned.i haven't put my sd card back in since.i initially thought it was an apps issue cause I had just installed some before it happened first time,n I uninstalled most of them with only like five 3 party apps stilled installed.my phone hadn't messed up after uninstalled apps,so I decided that maybe it was safe to add more that I needed,with one that I didn't n was new,as soon as I opened new app,it cut off.i was so bombed.thats when I said f it,I'll reset it,it a red worse,n that was friday,after reset n acting retarded for five mins,I haven't issues since.Between men,cars,n now phones,I cant figure this **** out!IT'S TAKEN EVERY FIBER N MY BEING TO NOT SMASH THIS PHONE.i really want my note 8,but I'm thinking about getting a refund but I'm afraid of getting another one with same issue.idkwtd! I'm so sick of YouTube,I literally gets a headache.