The only time I had my K2 freeze on me was when I ran the battery down. I didn't think it was down far enough, since the battery gauge showed half full. But apparently it is not accurate.
I called Amazon and they instructed me how to restart it after charging and it should "calibrate" the battery gauge. The calibration didn't work, it is still empty when it reads half full. But I do get at least a couple weeks' worth of reading on one charge.
I recharge now before I get to that point and have never had another problem.
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