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Which form did you encounter this issue with? I checked the submissions on your most recent form and I was able to download them as PDF.
You have a lot of submissions on your form, so perhaps you can try partially downloading the submissions per week or month. Please follow this guide on How to Download Form Submissions as Excel/CSV/PDF?
If the issue still persists, please let us know.
On all of my forms I cannot download more than one submission at a time it keeps timing out. Even on some of my singular submission downloads it times out and I have to press Download PDF 3-6 times before it actually works.
Upon testing this further with attempting to download pdf submissions from one of your forms with several on it I found I am able to replicate the problem.
I did test this separately on one of my test accounts but I couldn't replicate it elsewhere. But also, I noticed that it works fine within a few seconds for one at a time but seems to lag out if multiple are set to download for pdf.
There appears to be a delay on our server or something of the sort so I'm sending a bug report about this with your threads to have our developers check it out so we can get this problem resolved and then we'll update you as soon as we can.