Robot spins in circles or cannot navigate straight; no specific error code shown.

Safety first: Turn off and flip the robot over.

Mechanical checks:

• Inspect both drive wheels for equal tire wear; replace tires or wheel modules if one is significantly smaller or damaged.
• Clean around the wheel hubs to prevent dust from entering encoders.

Sensor reset:

• Perform a factory reset or sensor calibration via the Tesvor app if available.
• Place the robot on a flat, open area and run a test cleaning to see if navigation improves.

If the issue persists: One drive motor or encoder may be failing, or the IMU may be out of spec. Replacing the suspect wheel module is the first step; if that fails, main board replacement may be necessary.