random problem

[eggman]

Hello everyone,
I have a strange problem, I wrote a little program to control a VMUSIC2 MP3 player. It plays an MP3 with morse beeps that will then switch a lamp. The user can change the MP3 file without having to mess with the program.
After playing the file the player should wait between 0 and 45 minutes randomly before playing the morse code again.
All works okay but after a while the randomness disappears and it will always wait 45 minutes. Seems something wrong with the random command, maybe the seed? any help is appreciated. Here's the code:

' 12-05-09 morse code player, reads mp3 file to control lamp

@ device  pic12F683, INTRC_OSC_NOCLKOUT, wdt_off, pwrt_on, mclr_off, protect_off

include "modedefs.bas"
define  OSC 4
                           
OSCCON     = %01100000      ' Set to 4MHz	
CMCON0     = %00000111	    ' Analog comparators off 	
ANSEL      = %00000010	    ' Set AN1 as analog, rest digital 	    
TRISIO     = %00100010	                       
GPIO       = %00010000      ' GPIO.4 hoog voor serieel, start anders niet

relay       var GPIO.0
led         var GPIO.2

counter     var word
temp        var word
time        var word
audio       var byte 

pause 2000

loop:
     SerOut GPIO.4,T2400,["V3A",13]          ' play all songs
play_morse:
     toggle led
     adcin 1,audio
     if audio > 25 then                      ' test sound (more than 500 mV)
         high relay
     else
         low relay
     endif     
     SERIN2 GPIO.5,396,20,play_morse,[wait ("Stopped")]
     random temp
     time = temp/24                          ' between 0 and 45 seconds
     for counter = 1 to time
        pause 1000
        toggle led
     next counter
goto loop 
    
End