Imported data is flat

Greetings, I am trying to import a segment of data from the raw file, However, when I view the imported file all of the channels are flat apart from some low-frequency deflections and small noise. When I review the same raw file it's fine, but the imported file is altered. If the imported file is less than 90 seconds this doesn't happen and happens for segments longer than 90 seconds.
Does anybody know what the problem might be?
best regards,
Ali

Is there an artifact at 90 seconds and is auto scaling on? That would explain why the rest seems flat. You can check this in the amplitude section in the plot options. A quick and dirty way to check is just clicking the plus a few times next to the plot.

Kind regards,
Steven

Dear Steven,
Thank you very much for your guidance. I will check the things you said and see if it works.
Best Regards,
Ali

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