I understand you are experiencing issues with your A20 + Transmitter. Here are a few steps you can take to attempt to remedy the issues.
If using a gaming console (PS4/Xbox One) make sure the Transmitter is in Console Mode. Power button should be illuminating Blue on PS4 and Green on Xbox One. Check to make the switch on the side of the Transmitter is switched to “Console”.
If using a PC or computer, make sure the Transmitter is in PC Mode. Power button should be illuminating White. Check to make the switch on the side of the Transmitter is switched to “PC”.
Try connecting the USB to different ports on the console and ensure the console is identifying the Transmitter as your voice audio source.
Ensure that all the connections from the Transmitter to the console or PC are secure.
If these steps did not alleviate the issues you were experiencing, please go to the link below and submit a case. Let your agent know all the steps you tried and the outcome of your troubleshooting. It will help speed the resolution of your case!
Support Channel: https://www.astrogaming.com/contact/