Problemas con ip phone 2912

Estimados.
tengo un problema con el telefono ip modelo 2970, el cual en algunos momentos no recibe energia y se bloque, y para resolver momentaneamente este problema si preciona 3 veces el numero 3 y vuelve a levantar,mi pregunta es ¿porque se produce este problema, y como puedo solucionarlo?
muchas gracias
             juan ibañez

Cisco does not make phones with model number you mentioned.

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