What Causes High RPM Bearings to Suddenly Vibrate and Slow Down?

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rizkiyoist
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When I spun a dry bearing or even toy car in high rpm it can suddenly vibe and slow down while making grinding noise... sudden loss of spin. I suppose this is because the bearing is rather loose and then vibe (like pulsing vibe) thus slowing it down. What does this vibe effect called? This can happen in basically anything that has dry bearing or spool.
 
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I think it's called "Rotor Whirl", "Dry Whirl" or "Dry whip". Something like that.