If the sound of your Soundcore Infini Pro cuts in and out when connected via HDMI (ARC), please try these steps:

1. Try a different HDMI cable.

2. Move your Soundbar to a different position.

3. Turn on the Soundbar and reset it by holding the Source and Vol+ buttons at the same time for 10 seconds.

4. Test the Soundbar with a downloaded audio file.

5. Try connecting the Soundbar to a different device if possible.

If you still have any concerns or questions regarding this sound issue, please contact Soundcore customer service and make sure to mention that you've tried the listed steps above for a quick and accurate solution.