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This phenomenon may be caused by some interference between the vehicle communication system and the mobile phone. There are several possible reasons:

Electromagnetic interference: Other electronic devices in the car may interfere with the mobile phone or car Bluetooth system.

Bluetooth connection problem: The connection between the car Bluetooth system and the mobile phone may be unstable or have compatibility problems.

Software problem: There may be a problem with the software version of the vehicle system or mobile phone, which needs to be updated or repaired.

Hardware problem: A component of the vehicle system or the Bluetooth hardware of the mobile phone may be defective or damaged.

The solution can try the following steps:

Restart the mobile phone and car system, and re-establish the Bluetooth connection.

Check and update the software versions of mobile phones and in-vehicle systems.

Try connecting the in-vehicle system with another mobile phone to see if the problem still exists. This can determine whether the problem is the mobile phone or the in-vehicle system.

Clear the Bluetooth pairing record of the mobile phone and the in-vehicle system, and then re-pair.

If the problem still exists, it may be necessary to consider the 4S shop for inspection and maintenance.

I hope I can help you solve this problem!