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A frozen Kindle may be the result of a low battery. If you know that your Kindle is low on charge at the time it locks up, connect the device to a power source. Amazon recommends letting the Kindle charge for approximately three minutes before you take further action. After the Kindle has charged, attempt to reset the device by holding down the power button.
A freeze up can also be caused by low refrigerant and improper fan operation. Low refrigerant levels make the coils too cold, and a faulty fan prevents air from moving. Faulty thermostats and drainage problems are often causes of a freeze up.