Transaction generate tx but not send to network

Hello.
I use geth 1.8.5 and go 1.8.3.
Transaction sends to network through api. And i have a case. Transactions send normal, but some time transaction registered in log but not received to network.
In log i see this information
INFO [06-12|21:40:01] Submitted transaction fullhash=0x36307b0effb206271deefe9782f10b148c6fb35a84bf73ca1c71ea102447648a recipient=0xd3a9238227ea0ce1f474

How i can understand, what happens ?
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