ledc doesn't work after restart or deep sleep wakeup

[Auxal3000]

Hello
I'm using a ESP32 CAM that has a Led-flash included. I initialize the led in the program and it works ok. But if I call ESP.restart() or after a sleep wake up and the ledc is always of.
I don't know what to do.
Thanks for any help

[Auxal3000]

I forgot to send the code:

Before setup:

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#define ledFlash           4 

into setup():

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    ledcSetup(LEDC_CHANNEL_7, 12000, 9); 
    ledcAttachPin(ledFlash, LEDC_CHANNEL_7);
    ledcWrite(LEDC_CHANNEL_7, 0);

into loop():

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 ledcWrite(LEDC_CHANNEL_7, 50);

[Auxal3000]

Solution found

I have seen that before to enter to sleep mode I used the instruction:

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rtc_gpio_hold_en(GPIO_NUM_4);

This block this GPIO to prevent any changes in this pin.
After restart, the chip must execute the instruction:

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rtc_gpio_hold_dis(GPIO_NUM_4);

to unblock it.