It may have a poor or insufficient power supply.
If that's the case, when you turn the volume up, it draws more current, which if it doesn't get, it may shut down, as a safety precaution.
Ensure the radio power wiring is correct and if it's a high-power output unit, this should be direct from the battery, using suitable fuses of course.
Ensure the negative (earth) cable is connected to the battery and not using the vehicle body to obtain it's connection
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