[Q] S4 screen 'loose' screen assembly topic

When replacing my S4's lcd I also decided to replace the frame/chassis. I used double sidded 3mm tape around the edges so the glass would stick to the frame/chassis, though some of the tape has lost it's stickyness. The glass has somewhat lifted up (I can get my nail underneath and lift the glass, i'm unsure if the lcd lifts up too), the areas of which have lost their stick is around the top corners (mainly around where the LED is but i've noticed it along the whole top of the phone). I've tried lifting the glass slightly and putting some more tape underneath it which has not work, also, i've tried heating it up with a heat gun which also did not. I am contemplating using hot glue but a the time being I am still undecided if it will be effective.

Has anyone else face a problem similar to mine? If so how do you correct it? Does anyone have a solution or any tips? (please note that this device is not under warranty of any sort)