We’re sorry to hear about your experience and appreciate you sharing your detailed feedback. For best performance, we recommend ensuring the lid is properly aligned and secured, and verifying the oil temperature with a thermometer if possible, as overfilling or debris buildup can sometimes affect thermostat accuracy. If you continue to have concerns, please contact our Consumer Assistance Center at 1-800-726-0190 so we can further assist. Thank you for your feedback, as it helps us improve future models.