There will always be little delay between true wireless earbuds and Bluetooth devices due to the limitation of Bluetooth technology. Normally, it will not be noticeable and will not affect your experience. Noticeable delays can be related to the true wireless earbuds, the connected device, audio source, app, and network. 

This article will help you to address serious audio delay between Space A40 and the device. To fix the issue, please try the following troubleshooting steps:

1. Make sure the Bluetooth device and earbuds are within Bluetooth range.

Make sure the Bluetooth device and earbuds are within Bluetooth range, and there is no signal interference between them.

2. "Forget" the earbuds in your device's Bluetooth history.

Clean the earbuds pairing history with your device and restart your Bluetooth device. Try to connect the soundcore A40 earbuds to see if the issue persists.

3. Reset your soundcore A40 earbuds.

If the issue persists, please reset your soundcore A40 earbuds. Make sure your earbuds have enough battery and the ear tips are not blocking the charging pins. For how to reset your earbuds, please refer to How to Reset soundcore Space A40 Earbuds. Then try to connect your earbuds with your device again to see if it helps.

4. Test your earbuds with a different Bluetooth device/App/Downloaded music.

If the above tips cannot solve your problem, you can test the earbuds with other devices, App and downloaded music or videos. If other devices have no sound delay, downloaded music/videos can be played fluently, it means that the earbuds are good. The issue might be caused by the Bluetooth devices, specific App and network.