Blank page on excel export for Form results

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I have a site with a contact form containing over 7000 entries and when I try and export to excel, I get only a blank page with no errors.

I found some other forum posts from a year or so ago and tried the solutions mentioned there but no go. I also manually increased the memory limit to 128MB but still no good.

Is there a proper fix for this?

I read in one of the posts that Franz also has this issue when exporting the member list from the concrete5.org site and his solutions was to just export from the DB with a query. I could do that if it is the only solution for this but does anyone know what the query is?

ideasponge