Huawei P8 Faq page 231

that your phone is overheated, stop using the camera for a while to let your phone cool
down.

When you are watching videos:
Video players differ in power consumption due to different codecs. It is recommended
that you use a hardware codec with low power consumption. The pre-installed gallery
and video player on your phone have low power consumption and generate less heat. It is
recommended that you use the pre-installed video player (choose the advanced player
when playing videos). Don't watch videos while your phone is charging.

When you are using WeChat:
− WeChat requires network access, so your phone is overheated especially in summer.
− Browsing videos in WeChat Moments involves a lot of data downloaded to your
phone, especially when the network signal is weak.
− Video chats consume much power of your phone, which is equal to the power
consumed when you are shooting videos and at the same time uploading and
downloading data. Update your phone if available for the latest optimization.

When you are having video chats:
Video chats consume much power of your phone, which is equal to the power consumed
when you are shooting videos and at the same time uploading and downloading data.
Update your phone if available for the latest optimization.

When you are making calls:
The heat generated by your phone increases rapidly when the signal reception is poor.
Your phone provides the industry leading heat control function for calls. If you still feel
that your phone generates too much heat during calls, check whether your phone's
reception is poor. To reduce the power consumption and heat generated by your phone, it
is recommended that you don't keep your screen on for a long time during calls, or
charge your phone during calls.

When you are using a navigation application:
Navigation applications consume much power of your phone, so it is normal that your
phone is overheated. If you haven't downloaded an offline map to your phone, map data
will keep being downloaded during navigation and your phone will generate more heat.
Your phone also gets overheated if you are using your phone in a car, or the signal is
weak or unstable (the RF transmission power increases). Therefore, do not use your
phone in a place with high temperatures or directly in sunlight.

When you are using a stock speculation application:
Stock speculation applications require real-time network access to refresh data, which
consumes much power of your phone, so your phone gets overheated especially in hot
weathers. To address this problem:
− Close background applications after you check the stock data.
− Deselect the stock speculation application from Settings > Power saving >
Protective apps.
− Enable Endurance under Settings > Power saving.
− Update your phone to version B151 or later.

When you are listening to songs:
It is normal if you feel that your phone is overheated when you are listening to songs
with the screen turned on, especially in hot weathers. Your phone's music playback
quality has been improved and more heat may be generated while songs are playing. If
you feel you're your phone is overheated, reduce the volume. Also don't play games or
perform other operations while you are listening to songs.