Lenovo Yoga Laptop Keyboard Backlight Not Working

Approximately 3 months ago, the keyboard backlight of my laptop, which had only been in use for a month, spontaneously malfunctioned and stopped working. I sent it to the service center, and they returned it after repairing the issue without providing any explanations for the cause of the malfunction. In fact, I sent the device with a request for an exchange because a computer used for only a month should not independently develop such problems. However, in the end, they simply fixed the issue and returned the device to me without offering any alternatives. Now, after 3 months from that incident, the same problem has occurred again. I was told to send the device to the service. They claim that even a slight jolt during transportation can cause such issues with the keyboard backlight. If such a small vibration can lead to this malfunction, it raises the question of why this device was not initially designed as a stationary computer. The device, which is only 4 months old, is being sent for the second time to another city, and I don't know what might happen to it on the way to the service. The product clearly falls under the definition of defective. If a replacement with a new device is not offered this time, I will have to resort to Consumer Rights Protection Court.