why when I play with bots, it stopped running for some time?

Depending on your system, a computer may take up to a few seconds to think about what to do next. This has higher chances of happening when it is either going somewhere far away or carrying a lot of items, because these factors directly impact performance when calculating the best possible path. On the same note, an issue has been reported where a computer may stop playing entirely. This behaviour is not intended, and should be fixed in the new version, available next weekend.