ESuite 6.2 - Sometimes the ActiveX-Trend for the InSQL-Data shows no values


we have a problem with an Esuite 6.2-Project running on Windows7 with SQL Server 2008.
Sometimes the Acitve-Element for Historical Data (InSQL) shows no values when I open the screen in Intouch WindowViewer, but the data is still recording.

If I restart the computer, everything works as usual. there are no recordings lost.

Can you give me hint how to fix that problem?
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