Sony XM-504Z Car Audio Amplifier "xplod 300w" Questions

...xplod sony 300w subwoofer ... I got my battery changed last week and 2 days later my Amplifier turns off, at high volumes, I saw the exact same problem on another post, but the "help" didn't help, or ...

...xplod sony 300w subwoofer ... I got my battery changed last week and 2 days later my Amplifier turns off, at high volumes, I saw the exact same problem on another post, but the "help" didn't help, or ...