Please check here;
It can be related to triggers, workflow rules and process builder. Sounds like you are running it to often, in that sense, many rules kick in on those criteria. Try to bring them down. What else is happening on Status Resolved??
Thank you for your answer.
It's strange because if I complete the children itself, the flow is triggered without any errors (and it works) whereas it make errors coming from father through "Close Linked Incident".
I have checked the log but find nothing...
I will continue search