Weird Random problem

Code:

---

Auto_Whistle:
  'Check for auto whistle (shares V_Bat input)
  'ADCIN Batt_Whis_ADCIN,V_Mon       
  'if ((V_Mon < ADC_Low) and (Whistle_Off_Flag = 0) and (Percent <  50)) then      <<<<<<< This is the problem line
  if ((Reed_SS_Bell = 0) and (Whistle_Off_Flag = 0) and (Percent < 50)) then
      LOW LED      'Turn LED off for diagnostics
      high Sound_Whistle
      pause 750                     
      low Sound_Whistle
  endif
return

---

The above code works great. 50% of the time the "whistle" will blow, which is the goal.

Code:

---

R_Num_Seed = R_Num_Seed + 1
  Random R_Num                        'shake the dice
  Percent = (R_Num//100)+1            'scale 1 to 100

---

R_Num and R_Num_Seed are words'
Percent is a byte.
The random code itself has been tested and proven in several other places with different PICs.

If I use the two commented out line for the ADC input, the result is the whistle blows about 95% of the time. Something with the ADC code is screwing up random. The actual hardware input doubles as a logic input and an analog input. I am using a PIC 18F14K22. AN2 is the analog input.
Is something in ADC stuff clobbering the random function?

Well, I finally gave up on this code. I had the same problem with another variation of this code and fixed that one. But the first is still a head -scratcher. I'm sure it has nothing to do with ADC inputs though. Just my own doing.