You can take measures to reduce background noise if your microphone is picking up unwanted sounds. Ambient noise may not be completely eliminated, but interference can be reduced. 

1. Forget Space Q45 from your device's Bluetooth history and restart your Bluetooth device.

2. Hold the Power and Volume+ buttons at the same time for 5 seconds to reset Space Q45. The indicator light will flash red three times, which means that the reset was successful. If the indicator does not flash, then try resetting them again

3. Switch to noise-cancelling mode while making a call to see if it helps.

4. Try testing Space Q45 with a different Bluetooth device in a different environment to see if it makes any difference.

5. Update the firmware to the latest version via the soundcore app.