It’s been suggested that one major problem is that the Huawei Mate 9 is overheating after several hours of usage. Another case that the Mate 9 overheats is when the smartphone is left in the heat for a long period of time. For those that have overhearing problems with the Mate 9, the following is a guide on how to help solve this problem.
How to fix the Mate 9 overheating problem:
There could be a good chance that a third-party application is the cause of the overheating Mate 9. The best way to check this issue is by holding down the Powerbutton and then tap and hold on Power off until you see Reboot to Safe Mode and then tap Restart. It should say safe mode in the lower left corner. If the problem is gone then you know it’s being caused by a third-party app. You can try uninstalling one by one to track it down or go for a factory reset.
Before you factory reset the Mate 9, it’s recommended to wipe the cache partition of the smartphone (Learn how to clear the Mate 9 cache). Turn the Mate 9 off and then press and hold the Power, Volume up, and Homebuttons together. After the Huawei logo appears with a blue recovery text at the top, let go. In the Recoverymenu you can use the Volume down button to scroll and highlight wipe cache partition then press Power to select it. When it’s done use the Volume buttons to highlight reboot system now and Power to select it.