yeah there has to be some external influence that is causing this. tempature of your house, elevation.
the fact that this only happening to you is really suspicious.
heres my advice, as soon as you get the new one turn it on and sign into your google account. then download these apps:
this is tablet cpu usage monitor and will show you how much of your cpu is being used. the second one is a bettery widget. once you have the battery widget installed go to the app menu click on it and change the, "show on tap" to degrees Fahrenheit. i have a feeling that that is not the problem because there is no way in hell that you have gotten what, 5 or more and the same issue keeps happening.
after you have theses things installed DO NOT PUT THE DAMN THING DOWN UNTIL IT BREAKS OR THE BATTERY DIES
keep checking those widgets about every 5 minutes. this is going to seem tedious but really you need to isolate the problem.
please tell me how this goes and PM me if it does break. also do not plug it in!!!!!!!!!!!!