A number of circumstances can cause both audio and video to be out of sync on a Cosmos, Solar or Solar Portable projector, including the following:

• A low-quality HDMI cable that connects the projector and an HDMI output device.
• A poor connection or the HDMI output device connected to your projector.
• A Bluetooth speaker is connected to your projector at the same time when it is connected to another output device through HDMI, which may cause the data transfer and decode process more complex and lead to an audio/image delay.
• When there is something wrong with the prjector itself, such as out-of-date firmware, system settings, or excessive amount of cache on the projector.

When an audio/image delay issue is occurring on your projector, please see if the following steps can resolve it:

1. Update the firmware on your projector to the latest version by selecting Settings > Device Preferences > About > System Update;
2. Try to connect the projector to another HDMI output device (e.g. a computer, a Fire TV Stick, a TV box) through HDMI only without connecting the projector to an external speaker via Bluetooth;
3. Change the project mode on your Nebula to "game" mode through the steps given below, especially when you are doing a game streaming experience:

• Press and hold the "settings" button on the remote after entering the HDMI input interface and the "Menu" option will come out
• Select "Picture Settings" and enter "Picture Mode"
• Choose the "game" option

4. Reset your Nebula by going to Settings > Device preferences > Reset when nothing changes after trying all the above steps.

If you have additional questions or if the issue persists, please contact us for further assistance. Make sure to mention that you have tried the listed steps so our agents do not ask you to repeat these steps.