ANSWERED
I ran into the exact same issue with the aria fitbit scale after couple years: Messages 'step off' and 'sensing' keep rotating and never go off until it drains the battery; scale unusable. I figure I will need to figure it out since it's not long under warranty. After I read through all the messages in this thread, I've tried all of the suggested steps such as re-calibration, factory reset, flip over, etc... Nothing worked. It was either hiding the message by chucking it in the garbage can like one of the good suggestion or trying to fix it myself since I had nothing to lose. I decided to open it up and see what I could figure out. And yes, I was able to figure the issue and fixed it. The steps and picture follow if you want to try fixing it yourself. Be ware that you're trying the fix on something otherwise will be useless so the worst is it's gone. If your scale is still under warranty then I highly suggest you calling fitbit support and get a replacement instead of opening it up since it probably will void the warranty
The problem is with the 4 base stands where the sensors are located and the parts sitting on top of the sensors are made of plastics and can be broken over period of use or some weird force applied to the parts causing it to break. This will cause the sensors to become unstable and keep jumping between state. The first picture show the scale after the bottom plastic base is removed. To remove the plastic cover, unscrew the 2 screws by the battery first then use a flat screwdriver to run along the side and pile it open. A little bit of force will be needed to push it open since it's pushed into the pillars on the scale (see picture).
Once the plastic cover is off, you will see the 4 base stands at the 4 corner, use the flat screw driver to flip the lock and remove the stand, Once your remove it you will see the break pretty easily by inspection. The second picture show that part closed up. You will need to glue the broken parts together. The best method I came up with is to get a piece of small hard wire and put across the broken parts and put superglue on it to attach to the broken parts together. To put this thing back to the base, you will have to make sure the spring coil is in correct position as well as the magnetic disc and the rubber ring. Just use a little bit of superglue to glue them in place. That will make your job putting them back to the base much easier. I recommend you taking pictures before removing things so you remember where things are.
That's it, putting things back and boom, my scale started working flawlessly again! Hopefully this will help those who are handy with tools or like to explore other options beside 'hiding the message' option :). I really doubt fitbit support will be able to help fixing the issue through the phone without replacement the whole because of the broken part.
Happy Scaling!
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