Why do I have to render audio when overlapping clips?

All of a sudden, I have to render out any edits to overlapping audio before I playback.  Even with Unlimited RT selected in my sequence settings, I get a red bar that needs rendering, even for the smallest changes.
Any suggestions on how I can edit without having to render edits to every change I make to my audio?

Go into your USER PREFERENCES and change the number of Realtime Audio Mixing from 8 tracks to 32

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