Error: Server Error The server encountered a temporary error

Hi there, some of my clients are intermittently unable to submit their order form. After pressing the submit button it sits there for several minutes then they receive the following error:

Error: Server Error The server encountered a temporary error and could not complete your request. Please try again in 30 seconds.

I see there have been updates to the Image Upload widget recently. I wonder if this may have something to do with it?

I have not been able to replicate the problem. One client was having the problem in Chrome but not Internet Explorer.

Here is a screenshot of the error message.

I have tried making a test submission to your form and uploading an image to each widget field.
The data submitted correctly, twice.

This could have been a temporary issue.
Let us know if you can reproduce this or if this happens again.
We are sorry for the inconvenience.

It does seem to be a temporary issue but one that has popped up with different clients over the past month. I see it popping up from time to time in other questions. Is there a known issue that can be fixed?

I see that there are multiple upload fields in your form.

These kinds of errors can happen when there are many files uploaded or the file size is very large.

I suggest you limit the maximum file size for the uploads and the number of files that can be uploaded.
Complete Guide: Changing the File Upload Size Limit