Why does the sound suddenly become smaller and better after the oppo r5 phone is restarted?

According to your description, the failure may be caused by the following reasons:

1、? The microphone is broken.

2、? Component leaks or variable values. ?

3. Re-weld or replace audio (power supply, CPU).

4、? Increase the working voltage of microphone (MIC).

The specific reasons and operation methods are as follows.

1. The power saving mode of the mobile phone is turned on, resulting in low battery, so you can turn off the power saving mode.

2, the problem of headphones, try another headset.

2. The mobile phone software version is out of order, so it is recommended to update to the latest official version or refresh the system;

If all the above methods fail, you can send them to the local customer service center to help you check and handle them.