If it turns off in the middle of a pour, I'd say you've got a bum unit (or a bad battery/connection). No matter what scale you're using, auto-off should only kick in when it hasn't registered a change in reading for some time. If it turns off in between ingredients, no big, just turn it back on; you were going to tare it first before you put in the next one anyway, right?
Hmmm...it did turn off as I was pouring!
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