I'm sorry you are experiencing this.
Have you reported the problem to our customer support? I'm sure they could assist you in solving this.
In the meantime, try using Save instead of Save As.
And rename your sheet to a different name while saving.
Thanks for your understanding.
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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I told customer support last year on the phone. They told me it's a known issue.
Using Save instead of Save As doesn't solve the problem (same error).
Renaming isn't an option either, because the error occurs before I get the chance to enter a (new) name.
Me and my colleagues experience the same issue on different devices. The only way to deal with this is saving your work every few minutes (which then takes a minute to process). Frustration all over the place.
This should be a well known issue by now, isn't it?