Speaking with a woman about her texting behaviour?

There's this woman I've gone out a few times with, although there's nothing official between us as we now live far away from each other. We've had several phone/video calls and texted back and forth, and I've definitely received many positive signs from her, especially whenever we met in person. And I think I've made my feeling clear to her, through all my actions, although I haven't said it to her yet.

However, one thing that has been bothering me is her texting habit, which she has admitted in the past. There would be times when she would suddenly stopped replying or taking days to reply back. It's always significantly better when we're in the same city.

This is making me confused and sad. Should I speak with her about this and how should I put it?
Speaking with a woman about her texting behaviour?
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