Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ink comes and goes.

I've never experienced anything like it. Every pen in the box did the same thing - write fine for a few sentences, then die on me. After shaking them and trying again, ink would appear for a few more sentences. Customer service was very good, but a second box of the same pens did the same thing. I wonder if they were stored someplace too hot or cold? Can't say, but it was so odd for new pens to not work.