Click on the picture or go here:
http://s738.beta.photobucket.com/us...3-2B723586CF5F-2143-000000FAACFD43EA.mp4.html
for a 15 second video of the popping.
I don't have to heat it up much, just an average of 90-110 Fahrenheit, but after an hour and a half of web browsing, iTunes, and word processing it does this at a 90 degree angle. If I let it sit overnight it goes back to normal, but I have noticed the hinge is consistently stiffer from about 70*-120*, while opening ONLY. The computer is a mid-2012, 13", bought a month or so ago. Planning on taking it to Apple but I'd rather not have a new computer taken apart. Anything that fixes this besides floss? it just started a few days ago.