It's because the bot doesn't continuously spin pokestops. It stops spinning after sometime and when you run out of pokeballs, it just roams around not spinning pokestops or catching pokemon (since you have no pokeballs). At least that's what the bug is for me. I'm sure the rest of you have the same problem.
I don't have a this problem with pokestopos. The problem is that it does not show the attracted pokemons from lured pokestops and after a certain time stops to catch pokemons in general.
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