Gosh, I read the first post again and I think I completely misunderstood what the problem is. I think these are possible causes for the problem:
1) The glass is too large for the case and, since the ends are glued securely and giving no quarter, it's bowing the glass upwards in the middle. Since it always seems to be the same edge that separates, I'll bet that was the last part to be pressed down during the assembly process. When you get the tablet warm, the glass softens a little and relaxes back down to the bezel.
But, it seems when you get it warm, the glass would expand as it heats and the bowing would get worse. So...
2) The case underneath expands as the device gets warm, allowing the bowed section of glass a place to settle back down to.
3) There must be too much disparity between the expansion of the case and the expansion of the glass. If they repeatadly expand and contract at different rates, they'll start to come apart.
4) To counteract the shifting action between the glass and the case, they used a rubber cement that would allow flexing, but chose one with too low a "melting" point(too gooey). IF they chose a glue with too much hardener, the glass would probably break from being stressed and flexed by the shrinking/expanding case it was attached to.
5) The case and glass do not heat and expand evenly, because the source of heat is greatest near the cpu and other chips, causing that area to flex more.
If you look on the IFixit website, you can see that the motherboard, including the processor and chipset, are located on the same side of the tablet that is coming apart(the left). It makes sense that this part of the tablet gets the hottest during heavy use. They probably have to peek at that side as they are closing it up to ensure all of the ribbon cables remain connected before "sealing the tomb".
Nexus 7 Teardown - iFixit
See the Step 5 photo. The right hand is holding the front of the tablet with it's back to us. That puts the CPU on the left if it was turned back around to face us.
I think if you turn the tablet off (so that no heat is being generated from the inside), then evenly warm the tablet in a shaded part of a car interior on a hot day or in the oven when it's set on WARM, all edges of the tablet will flex at the same time and the glue will soften evenly. When it cools and contracts evenly, the glue will firm up as everything seats itself evenly. I would not heat the tablet past 100-110F. I don't think you need to place it in the freezer afterwards, per my earlier post.
Otherwise, it sounds like the trick is to only use the tablet outdoors when it's cold and only play HD movies or 3D video games for 5 minutes at a time, with a 30 minute cool-down intermission. That's not so bad. Just kidding.
Don't we have any engineers that ordered one of these?
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