Netflow Does Not Display Conversations

Netflow Does Not Display Conversations

Hi, in the last days I have this problem with severals Interfaces (Not All) If i want to see the conversations of the last 15 Minutes or last Hour it does not Show me nothing, I can see the grafic but I can not see any conversation It just Work if i put Last 6 Hours or last day or any other big value. Do you have any idea Why can this happend?

Thank you!!!
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