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The only timer in the plugin (in do_lookups) wasn't consistently started at the beginning of plugin hooks. On the lookup_rdns hook, the function first did a rDNS lookup, which took some variable amount of time, then launched do_lookups, which did some more lookups, this time with a timer, but the timer wasn't shorter than the plugin timeout, so you could easily get DNS timeout errors in the logs.
Checklist: