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Hi @9537044636,
Welcome to the community.
It is normal for your device to heat up when you use CPU intensive applications.
If you are concerned about your device I recommend you contact your local support team. You can use the link in my signature to find their contact information.
This is very common issue on this particular handset, and its very frustrating because when you visit the Service center the most common and simple resolution they give is back up data and will update the Software or the OS, but unfortunately thats not the solution. It is very true if you play any games or speak for long it becomes too hot. and after scratching my head through for the past 6-7 months I found out that the chipset Snapdragon 615 is the Root cause of it. I am not sure why Sony still using it but read somewhere in some forum that the chipset has got heating issue and this cant be fixed by updating anthing only be fixed if the chipset is changed or updated in next version of it (as per my understanding).
Few References (might help):
https://www.quora.com/Why-do-smartphones-with-the-Qualcomn-Snapdragon-615-chipset-heat-up
https://www.quora.com/How-do-I-stop-Snapdragon-615-from-overheating
https://www.quora.com/Is-there-any-problem-with-Qualcomm-Snapdragon-615-chipset
yes it heat up faster when you are outside in the sunshine... happens to me sometimes so what i do it turn it off for about 5 mins and lrt it cool a bit and turn it back on
devices usually tend to warm up after being used for prolonged lenghts of time. how long do you usually play games, browse the net or watch videos? there are also background tasks that contribute to this.
try to boot your device to safe mode, to see if the heating still occurs after using the device for a long time.
remember the device is equiped with thermal protection, it will restart or shut down when excessive heat is detected, but as long as the device works then it is still within its limits.