Why is the sound of text messages and phone calls intermittent when the screen is locked, and normal when the screen is not locked?

After the screen is locked, the phone goes to sleep, and the cpu frequency of the phone will drop to a very low level.

If the mobile phone doesn't support audio file hardware, low-frequency soft decoding will get stuck, just like a computer: Do you want to use a PC to play blue light? Look at it if you want, and you can't return it if you want.

The following is only for smart phones: it may be because there is a bug in the firmware of your mobile phone, or there is a problem with hardware decoding, which leads to the receipt of text messages. When the call came, the cpu of the mobile phone was still at a very low frequency, and it did not recover to the frequency at which it could decode audio smoothly when ringing (it is not excluded that some power-saving applications are playing tricks), resulting in intermittent sound when locking the screen. Suggest to report to the manufacturer.

The screen elbow is not locked, and the cpu keeps a certain frequency, so it is normal.

The above is my own understanding, please copy the party by the side.

I hope the answer will help you.