Ventilation 101
Every high-powered smartphone including Galaxy S4 can produce too much heat due to its processor and it is best advised to play or use high-powered apps in a well-ventilated or cool area. Cooler temperature reduces heat and even helps minimise battery consumption.
Watching Room Temperature
Never leave your Galaxy S4 inside a car which traps heat that will bring the smartphone to a boil. High temperature will weaken the performance of your smartphone and can affect battery life expectations.
No Solar Panels Yet
Galaxy S4 is not immune to sunlight and doesn't recycle its power so never leave it on surfaces with direct sunlight to avoid damaging the battery and accumulating heat.
Leave it Recharging
Playing high-graphics gaming apps while recharging can cause overheating which may become harmful to you. Leave the smartphone to recharge before playing again or turn on the air-conditioning if you have one to manage heat.
Casings Out
If your Galaxy S4 uses casing or similar accessories, remove it during heavy playtime or recharging to allow heat to escape more effectively. Accessories such as those can trap most of the heat on the device.
Checking Voltage
Some electric sockets may have varied voltage than can cause fast recharge or otherwise. Fast recharging can be good but uncontrolled voltage may cause too much heat; try recharging your Galaxy S4 on sockets or extension cords that manages voltage.
Free Up Some Memory
Too much running on the RAM can also cause overheating problems since the device keeps handling so many things at a time. Uninstall or disable unnecessary apps, reboot the device regularly or use the built-in Task Manager to app to free memory.
Internet Connection
Browsing and Web streaming require data processing which means, more tasks for the processor to do. More processing also points to more heat generated by the CPU cores and since Galaxy S4 can have up to 8 cores depending on which variant, overusing Internet functions can lead to overheating.
Minimise Lights
Brightness on the display may contribute heat especially if it's too high. Manually configure the brightness level according to your comfort or use dark coloured wallpapers to reduce needs of the screen to produce light. Moreover, video light in use can also contribute more heat.
Galaxy S Features
Some apps from Galaxy S4 perform multi-tasking and it can allow you to do two things at once. But manage how you use them and only if necessary for multi-tasking requires more processing leading to more heat generation.
Use Newer SD Cards
SD cards may contribute to almost half of overheating issues known with Galaxy S4 and it is recommended to buy newer ones then throw away the old microSD cards. Older cards forces the S4 to translate old, corrupted and worn out data that causes the processors to do more than usual.
TouchWiz Services
Samsung added too many features on the TouchWiz and some of them are not usable for everyday living. Turn on only those that you truly need and leave others quite to help save battery life, memory and reduce processing needs.
Wireless Radios
Disable Wi-Fi, Bluetooth, GPS, NFC and mobile data if you are not using them to prevent battery drain and reduce heat.
Clearing Data
Sometimes, clearing data and cache may help reduce overheating issue related to processing and loading. Go to "Settings > Application manager > Select an app > Clear data and clear cache."
Using Customised ROM
If you don't mind letting go of TouchWiz UI, use custom ROMs which features tweaks that help memory management, performance and power optimisation. Custom ROMs usually have bigger free space for they only use basic services that can help reduce overheating crisis.
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