I step on my scale three to four times within a minute to pick the most stable number. How you have your feet, leaning forward or backwards, all of these things can alter the numbers. Like this morning Mine first reast 233.2, then 232.8, then 233.2 again. The middle time, my left foot was a little in back of the right foot accidentally. So yes, fluctuations happen.
However a 3 lbs difference is a BIG difference. I probably would have stepped on it several more times to see if it is consistently doing wonky things and if it was, I would change the batteries.
Oh, also if you have it on a tile floor, make sure it's feet are not resting on cracks/grout lines.
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