If the root issue was that SG had lost the server’s mutation feed, this would have been fixed when you restarted SG.
The latest SG log provided looks like a mix of the pre-restart logs (23:20:08 timestamps) and the post-restart (the single 08:11:12 timestamp), so it’s not really shedding any more light on the situation.
If you have the full pre-restart logs, it may be useful to see a grep of those logs searching for the sequences in question (431351, 431352). If you want to post those to a gist, I’ll take a look to see if there’s any additional information there.