one hour holes in hourly graphs

From time to time I get one hour holes in my Hourly Collection Graphs and Hourly Received Reports.

fr.flightaware.com/adsb/stats/us … ardDussart

I check the piaware client log file and I see that data is normally transmitted to your server all along the day.

Do you know the reason of this problem?

Hi!
Look here: ads-b-flight-tracking-f21/weird-fa-page-stats-behavior-t38811.html