to replicate this 1. use different wallpapers for lockscreen and homescreen 2. double click the power button while u are on homescreen, u can see yellow border flashes and goes away on lockscreen. normally when i double click the power button a yellow border appears covering the whole screen and goes away, i had this issue from day one. but today the yellow border got stuck behind just the status bar and not the whole screen and with a black background on status bar. this was gone with a restart but the yellow border covering the whole screen still appears when i double click the power button. i did factory reset but the problem still exists. if u use same wallpaper for home and lock screen there is no issue.