Over the last several days it has been a challenge as an operator of a small upvote bot to handle many missed transactions. It has been an issue since the recent DDOS attack on Steemit and Steemit Nodes I Think That Has Caused Some Issues! @SteemThat and @binkley are penny bots but we do random audits regularly and I'm sure these large upvote bots do also to keep their good reputation.
The challenge when the nodes are down is it might appear that the upvote bot upvoted and commented because everything says they did but since the block chain was down the upvote didn't actually happen or the upvote happens but the comment was missed. I have seen several recently where the upvote was made but the comment was missing with our small upvote bots.