Adeept 5-DOF Arduino ROBOT ARM

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I purchased the Adeept 5-DOF Arduino compatible programmable orange robotic arm kit with OLED display. I looked at the user manual and used an example called AdeeptSimulation. After uploading the code, I connected the power with a USB cable. There was a phenomenon in which the servo motor operated randomly. When sero1, 2, and 3 are all connected in learning mode, malfunctions sometimes occur, and malfunctions continue to occur even in automatic operation mode. What's the reason?
In the manual, I only uploaded the AdeeptSimulation.ino code.

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I had a similar issue when I first set up the Adeept 5-DOF arm. The random servo movements usually happen when the power supply isn't providing enough current — especially when multiple servos are active at once. Using only the USB cable for power isn't enough in most cases. I ended up using an external 5V 2A power supply and that fixed most of the instability.