Answer:
The battery is going bad.
Step-by-step explanation:
The mobile phone's back case becomes hotter as compared to the normal, as well as the device battery begins to draining its power even faster than normal. That consumer also examined against threats, removed unnecessary applications as well as reduced the phone's brightness amount, but perhaps the problems continue because the following handset battery remains dropping badly.
So, the following answer is correct according to the given scenario.
The remaining options are incorrect because the following option is suitable for the draining problem of the device.