How can I stop my computer from freezing when one of my external monitors change inputs?

I have 2 external monitors (Alienware AW2518HF) hooked up to my MacBook Pro, Mini DP & HDMI. My second monitor also has my Xbox One connected to another input via HDMI. When I change my input to the xbox, it makes my Mac freeze every 3-5 seconds until I switch the input back to the Mac and then it's... show more I have 2 external monitors (Alienware AW2518HF) hooked up to my MacBook Pro, Mini DP & HDMI. My second monitor also has my Xbox One connected to another input via HDMI. When I change my input to the xbox, it makes my Mac freeze every 3-5 seconds until I switch the input back to the Mac and then it's fine.

WHY IS IT DOING THIS & HOW CAN I FIX IT?
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