We have several screens where we show daily our production numbers to a large call center, the Chart is fed by a query taking values from 2 csv files in the same computer, there is another external batch updating the csv files every 15 mins, for some reason every certain time I see the image attached here in some screens but when I check the file the column is actually there, I guess at some point excel is getting information from the csv file and the batch is trying to update them at the same time, I appreciate any thought.