Bests & Worsts Reviews from Amazon

I bought this to weigh ground up coffee beans and have been using it daily. It worked great for a couple of months, then it all of a sudden started showing negative weight on the scale (one gram at a time) a few seconds after turning it on, and for as long as you leave it on. If you zero it out, it just does the same thing over again -- so you can't trust whatever it says when you actually start weighing something because it shows a lower number than it should. I tried switching out the batteries with brand new ones, but it still does the same thing. Shame on me for not checking the reviews before buying -- I see now that I'm not the first one to have this issue with this scale.