Chosen Solution
It seems that my iPhone X has got water damage, I can confirm this by looking into the SIM card slot and seeing the red line. The phone has been prone to getting damaged when in contact with water, from being in the rain or tipping water on in; usually the screen will flicker and after leaving it in the sun it works after. Not sure why my phone has had this issue. The other day the screen stopped working after going into bathroom, the steam seems to have damaged the phone and now the screen won’t turn on. The phone is still working as I restore via iTunes and it Is still receiving notifications. Can anybody answer me what might the issue be so I could possibly resolve it?
Apple did explicitly state that the water resistance feature and damage caused by water is NOT covered at all. Water resistance feature may degrade with use, but if any tiniest amount of water contact causes the phone to flicker, I suspect someone has opened the phone before and broke the adhesive seal, or it suffered a serious bend that did the same, normal use should not result in this temperamental behavior. Water damage is very difficult to repair, basic rule is: if you need to ask, you can’t do it, go find a professional.