Attiny85 sleeping malfunction

hello everybody! 
i working on project , got myself trouble. made simple sketch demonstrate problem.

first of using arduino uno programme attiny85 , want make sound 1 second , go sleep 8 seconds , repeat. using watchdog , pin change interrupts whenever push button during sleeping attiny85 stop making sound after every 8 seconds , instead led blink after every 4 seconds. when led not on attiny85 sleeping.

the problem time time (not always) attiny85 freeze in spesific location. when want move on making sound blinking led. after push button led blinks once , should go sleep, instead freezes , never wakes up. speaker goes wild if tiny has frozen , press button.

the code:

code: [select]

#include <avr/sleep.h>    // sleep modes
#include <avr/power.h>    // power management
#include <avr/wdt.h>      // watchdog timer

volatile byte eventflag;
int led = 0;
int speaker = 1;
int button = 4;
int nr = 1;
int reset = 3;

isr (pcint0_vect)
 {
  eventflag = 1;
 }  // end of pcint0_vect
 
 // watchdog interrupt
    isr (wdt_vect) {
       wdt_disable();  // disable watchdog
    }  // end of wdt_vect
void setup() {
  pinmode(led, output);
    digitalwrite(led, low);
    pinmode(speaker, output);
    pinmode(button, input);
    digitalwrite(button, high);
    digitalwrite(reset, high);
    pinmode(reset, output);
    // pin change interrupt (example d4)
    pcmsk  = bit (pcint4);  // want pin d4 / pin 3
    gifr  |= bit (pcif);    // clear outstanding interrupts
    gimsk |= bit (pcie);    // enable pin change interrupts
  }  // end of setup

void gotosleepspeaker(){

  set_sleep_mode (sleep_mode_pwr_down);
  adcsra = 0;            // turn off adc
  power_all_disable ();  // power off adc, timer 0 , 1, serial interface
  nointerrupts ();       // timed sequence coming up
  // clear various "reset" flags
  mcusr = 0;
  // allow changes, disable reset, clear existing interrupt
  wdtcr = bit (wdce) | bit (wde) | bit (wdif);
  // set interrupt mode , interval (wde must changed 1 0 here)
  wdtcr = bit (wdie) | bit (wdp3) | bit (wdp0);    // set wdie, , 8 seconds delay
  // pat dog
  wdt_reset();
  sleep_enable ();       // ready sleep
  interrupts ();         // interrupts required now
  sleep_cpu ();          // sleep
  sleep_disable ();      // precaution
  power_all_enable ();   // power on
}  // end of gotosleep


void gotosleepled(){

  set_sleep_mode (sleep_mode_pwr_down);
  adcsra = 0;            // turn off adc
  power_all_disable ();  // power off adc, timer 0 , 1, serial interface
  nointerrupts ();       // timed sequence coming up
  // clear various "reset" flags
  mcusr = 0;
  // allow changes, disable reset, clear existing interrupt
  wdtcr = bit (wdce) | bit (wde) | bit (wdif);
  // set interrupt mode , interval (wde must changed 1 0 here)
  wdtcr = bit (wdie) | bit (wdp3);    // set wdie, , 4 seconds delay
  // pat dog
  wdt_reset();
  sleep_enable ();       // ready sleep
  interrupts ();         // interrupts required now
  sleep_cpu ();          // sleep
  sleep_disable ();      // precaution
  power_all_enable ();   // power on
}  // end of gotosleep

void loop() {

      int state = digitalread(button);
   
      if ( eventflag == 1 ) {
        if ( nr == 1 && state == low) {
          state = digitalread(button);
          while ( state == low ) {
            state = digitalread(button);
            delay(10);
          }
          nr = 2;
        }
        if ( nr == 2 && state == low) {
          state = digitalread(button);
          while ( state == low ) {
            state = digitalread(button);
            delay(10);
          }
          nr = 3;
        }
        eventflag = 0;
      }//////////////////////////////////  part handling push of button

if ( nr == 1 ) {
      digitalwrite(speaker, high);
      delay(1000);
      digitalwrite(speaker, low);
      gotosleepspeaker();
} 
if ( nr == 2 ) {
      digitalwrite(led, high);
      delay(350);
      digitalwrite(led, low);
      gotosleepled();
}     
if ( nr == 3 ) {
      delay(100);
      digitalwrite(reset, low);
    }
}

i think got working adding wdt_disable();  after sleep functions ( gotosleepspeaker() , gotosleeplights() ). not sure still why helped me. 

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