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The history data is probably not lost. It's just that LabVIEW forgets to retrieve it. If you force a change of scale (for example modify the autoscale property of the X scale), then the whole history data should be retrieved. But long story short, a consensus is that charts are nice quick way to view some data while you're analyzing a certain part of your code during development, but they are not suited for a permanent solution in an application. In the latter case, you want to switch to graphs (either waveform or XY based on your needs).