Week 1: Servo jittered. Ground loop from separate power supplies. Fixed by tying all grounds together.

Week 2: PN532 stopped reading NFC tags. Dead. Replaced with a new one. Added TVS diode on the I2C lines for protection.

Week 3: Product jammed in chute. A bag of chips got stuck. Redesigned chute angle from 30° to 45°. Added a Teflon strip on the slide surface.

Week 4: ESP32 crashed during MQTT publish. Stack overflow in WiFi task. Increased `CONFIG_MAIN_TASK_STACK_SIZE` to 8192 bytes. Stable since.