Sheet not opening

Hi I've been using smartsheet for last one year, I'm having large four sheets, each sheet has around 1,00,000 cells of data and I haven't used any vlookup or any complex formula, used only link option for around 60k cells, today moving when I try to open those four sheets it says " your request has resulted in the following system messages and nothing happens then but other sheets working well.

.. Please help those are very important data for our production.

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