Download Report as a PDF slowdown and failed

Dearl All ,

PDF generation since today fails more often than usual.
We edit a document with about twenty pages whose PDF printing sometimes fails.
But since today the failure rate is 100%.
Either an error message "PDF download failed. Please try again." or the document is generated with a very large number of graphics not generated (system error)
Do any of you use the PDF printing function and have you noticed slowness or other problems recently?

Thanks 

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