Your servo motor may be suffering positioning errors through a setup issue or loss of parameters. To check, you can go through the usual setup procedures of both the motor and the connected drive. If something doesn't flare up, there may be a feedback issue with the motor that requires repair.

The circuit connections for this project are very simple as the servo motor has only 3 pins. The red wire of the servo goes to 5V pin of Arduino Uno. The Black wire of the servo goes to Arduino Uno's ground pin (GND). And the yellow wire (called the control pin of servo) goes to Arduino pin 8.