Microphone picks up sound quietly or poorly | Bose QuietComfort Headphones

Move to a less windy environment

Wind noise may enter the microphone capsule and render other audio unintelligible. Moving away from this area may allow for clear audio reproduction

Place another phone call.

Try placing another call—preferably to another number—to determine if the issue occurs all the time or only with certain people, which could result from poor reception with the phone service or device you call.

Be sure the headphones are being worn properly.

Check the cellular reception of your phone.

Try disconnecting other nearby wireless devices that might interfere with Bluetooth® signal.

Some wireless devices can cause interference with a Bluetooth signal.
Common examples include:-

2.4 GHz router
cordless phone
wireless speaker adapters
home security motion sensors
fluorescent lights
microwaves
wireless mice and keyboards

If there are such devices, disconnect one at a time and check if the issue improves. If so, consider relocating your product or the device.

Remove and reseat the audio cable in the connected device.

On the connected device, disconnect the cable that connects to your headset then reconnect it to be sure it is fully connected and secure. If you rotate the plug in the jack and hear crackling or intermittent sound, there might be debris inside the jack or on the headphone plug.

Reboot the connected device.

Electronics might need to be reset from time-to-time—much like rebooting a computer. Power off the device, then power it back on and try again.

Try connecting a different Bluetooth device.

If your Bose product can connect to another device, Bluetooth functionality is working. In cases like this, the issue could be with the first device or its settings.

Reset your product.

Much like rebooting a smartphone, your product might need to be reset on occasion to correct minor issues. For more information, see Resetting your product.