This certainly is not a normal behaviour of Illustrator.
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Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
An error occurred while saving the commentMike commented
Just wanted to 'SECOND' what Simon wrote: I'm experiencing this same issue but found that when I hid the Layers palette (following Simon's tip), the problem did not occur.