No, it's not the yoyo effect. Known yoyo effect is typically when the craft is flying forward and right after stop it looses and regain altitude.
From your video it should hover solid when close to the ground. VPS (Visual Positioning System) possibly to be calibrated (by you) if the behavior you are reporting is only occuring close to the ground, conditions being;
. stock blades
. not customized Rates settings in Go App
. no blade guard installed or other accessory
. last firmware installed
Note you have not confirmed trying somewhere else with different ground pattern.
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