[Maxx134]

Tips to avoid heat and pressure which causes this problem on our phone:
if in pocket, face screen out.
If streaming or GPS, slide screen open,
Do not use solid screen protectors that can warp and cause pressure,
especially when wiping to clean surface.
Only use soft flexible protectors like "BestSkinsever" or "zagg invisishield".

Lastly try a custom rom that runs cooler,
SOme run hotter due to what combination of version stuff cooked into it.
I can only vouch for "Vinn neodium/Plutonium" and Sharkie roms,
but that's not to say that's all, of course there are others,
the key is making note of the ones that last longest on battery,
those are also the coolest running.