The problem is probably due to faulty HDMI cables, not the Audio Radar.
Faulty HDMI cables are the main cause of a black or flashing screen. We recommend using high-quality HDMI cables to ensure the best performance for your Audio Radar. Based on our experience and user feedback, Anker HDMI cables are a reliable choice. Anker is known for producing durable and high-performance cables that can help reduce issues related to poor signal quality.
Check out these other articles:
How to Use DisplayPort with Audio Radar
Can Audio Radar be used with multiple monitors?
What should I do if my Audio Radar isn’t working correctly?