Return VS Goto?

[Fredrick]

Today i buyed PICBASIC Pro and made the first test program whit a PIC16F872

But when i use the code below the pic stops or hangs sometimes the (LED´s stop flashing) when i press the button (PORTB.0) but whit code number 2 it works fine..

Why?

ADCON1 = 7
i var word

loop:  
    
    High PORTA.0
    High PORTA.1 

for i = 1 to 30     
    Pause 10       
    IF PORTB.0 = 1 then GOSUB but
next i    
    
    Low PORTA.0
    Low PORTA.1

for i = 1 to 30     
    Pause 10       
    IF PORTB.0 = 1 then GOSUB but
next i
Goto loop   
                        
but:   
        high PORTA.2
        pause 1000
        low PORTA.2
RETURN

Code numer 2

ADCON1 = 7
i var word


loop:  
    
    High PORTA.0
    High PORTA.1 

for i = 1 to 30     
    Pause 10       
    IF PORTB.0 = 1 then but 
next i    
    
    Low PORTA.0
    Low PORTA.1

for i = 1 to 30     
    Pause 10       
    IF PORTB.0 = 1 then but 
next i 
Goto loop   
                        
                           
        
but:   
        high PORTA.2
        pause 1000
        low PORTA.2
goto loop