This used to work for me before the update from 4.1.2 to 4.3, now my display shuts down while i am reading e-mails, looking at sites, etc. Is there a cure other than the standard "do a factory reset"? If not I'll live without it, it was handy but not worth the trouble of setting up the phone again. I tried some of the cures I found with a search for this issue and none have worked. I've turned it off and then back on, changed the screen mode from Standard to Starter and then back again and it still doesn't seem to work. The Icon appears on the notification bar but it never lights up periodically like it used to. I never get the "can't detect your eyes" pop-up that I have seen on my Note 8, so I don't think it is really functioning. Is there a simple fix or should I just turn it off and forget about it? Maybe I need to turn it off and increase my time-off setting and move on, I don't have battery issues usually.