I’m facing a strange issue with my M5stack core implementation

When I generate a tone used to fire a sound alarm, a continuous “beep”, in my control process this causes a reboot of the M5stack core

I drive the GPIO25 with PWM signal (just need a beep)

Seems something related to the power used by the class D amplifier NS4148 that sink too much current from EA3036 buck converter and this cause ESP32 reboot

notice that I power the M5stack core via HLK-PM01 Enclosed AC DC Converter 1 Output 5V 600mA

does any one experience something similar ?
Any idea / suggestions on how to drive the audio amplifier properly to reduce power consumption ?

Thanks
Davide!