There are normal conditions under which bots may stop doing what they're supposed to be doing, or anything at all, but without details it's hard to say whether any can be at play in this particular case.
(The vast majority of issues get reported via Discord, since that's where most of the frequent players hang out, and will also help each other examine what's going on while it's happening (rather than after the fact), which is better for analysis, and most of the time it turns out to be a misunderstanding or lack of complete understanding of certain mechanics or interactions. Not saying that's the case here, just mentioning it for future reference. And I'm often around to look at issues as well, or get called in to take a look at the specific save to get to the bottom of it.)