I have a Frigidaire FUZ5572FF frost free freezer. It is about 4 years old. One day all my food had thawed out and the red warning light had come on. I switched the power off and left it for a while then when I switched it back on again it began working ok but about 10 days later the red light came on again and everything thawed out again. This has happened several times. Does anyone have a solution please?