DECODIFICADOR TSUNAMI TSU 1000

Hola buenos dias, soy de Argentina y me contacto con ustedes por un problema que tengo con decodificador Tsunami tsu 1000, que esta montado en una locomotora SD70 ACE fabricada por MTH y mi problema es el siguiente:

Al adquirir la locomotora, la puse a rodar con un sistema digital Z21 de ROCO y no tuve ningun tipo de problemas, funcionaba correctamente el sonido y todas las funciones, pasaron algunos dias y la puse de vuelta a rodar y el volumen de sonido era considerablemente mas bajo, sin haber cambiado ningun valor de CV, probe reseteando a los valores de fabrica a travez de la CV8 y no dio ninguna solucion.
Me pueden dar alguna explicacion o en su defecto una solucion a mi problema.
Desde ya muchas gracias.
Esperando su respuesta lo saludo cordialmente

Resetting the CVs or Starting Over Occasionally, something goes wrong and Tsunami will not respond as expected. Usually, this is caused by one or more CVs being programmed to the wrong value. The CVs can be quickly reset to their factory default values using the following procedure.
1. Place the locomotive on a powered section of track. Program CV 30 to 2 (or CV 8 to 8) using either Service Mode or Operations Mode. 2. Cycle power to the decoder by turning power to the track off and then back on. 3. After power is restored to the track, there should be no indication of activity other than the power LED turning on for a period of 6 seconds. If sound comes on immediately upon restoring power, the decoder did not reset. Repeat steps 1 and 2. 4. Once the 6-second period has elapsed, the sound should come on and the headlight, backup light, and onboard diagnostic light will blink 16 times indicating that the CVs were successfully reset. 5. Tsunami should now respond to short address 3 just as it did when it was first unpacked. 6. If you cannot get the decoder to reset, check to see that it has not been inadvertently locked (see If You Forget the Lock Code in the previous section).