When you click on an icon in the Dock, it bounces up and down until the application opens. Depending on how quickly the application load, the bouncing can continue for quite some time.
Many folks find these bouncing icons annoying. If you are one of those people, you can easily remedy this from the Dock Preferences dialog box. Choose > Dock > Dock Preferences from the menu and uncheck the box next to “Animate opening applications.” From this point forward, your dock icons will no longer bounce. Instead, the tiny light below the icon will discretely blink a few times until the application has opened.
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Did that. Stupid calendar icon still bouncing every 3 minutes.
Karen, I thought the same thing and found this:
https://www.macworld.com/article/1138403/dockbounce.html