Where's the BREAK comming from?

[Dan Egli]

I'm really confused as to why this keeps happening:

2020-09-20 03:36:31 Requesting 100 missing keys from <ADDR_INET 
[AAA.BBB.CCC.DDD]:11371>, starting with <A KEY HASH>
2020-09-20 03:36:31 <get missing keys> callback interrupted by break.
2020-09-20 03:36:31 DB closed

Notice the "callback interupted by break" line. What the heck does that 
mean? Who or what is sending a break? Whenever I see that line it always 
says DB closed right after, and the recon process terminates. I've got 
it auto-restarting after a 10 second delay but I'd love to know exactly 
WHY it's terminating in the first place. I'm the ONLY user connected to 
the server so it can't be someone else doing anything....

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--- Dan