I randomly get a 404 Not Found error for upload.php. I can be uploading a batch of photos and approximately 10% of them will produce this error. This then triggers the error to display on the page - HTTP Error. Upload URL might be wrong or doesn't exist. And the upload percentage won't reach 100%.

If I re-upload the same batch of photos different ones from previously will have the 404 error.

However, when I check, all the photos have been uploaded successfully.

My guess is this is maybe a hosting problem? But I need some further clues so have something to go to hosting company with.

Has anyone else experienced similar problems?