The Green line doesn't show up if I switch off the phone and on it. But when you use it for a while and put it on screen lock mode display off) and switch it on back after a while (about in 10-20 mins) then a green color line appears and it's very clearly visible on grey colors. And later on another mildly visible line appears right below the top line on the bottom side but it's not as visible as the line appears on top. Is it display problem? do i have to change the display?