I monitor cheerlights tweets using the twitter in node and every now and again - the debug node I have connected to it, starts displaying each message twice and keeps on doing it until I restart NR.
Its not a real issue for me as I just use it for info but I'm wondering if anyone else has noticed this happening to them.
I've noticed this after I do a partial deploy (flows only rather than full).
Does this coincide with your observation, or do you see it after a period of running "untouched"?