This doesn’t happen all of the time, but MOST of the time.
When I add the main product image using products > add new, I receive an unexplained http error and the image doesn’t upload.
These are very large images, usually around 9,000 pixels x 9,000 pixels and are around 4MB. However, I’m on a dedicated server and this is the only website on my Cpanel.
Also, on a few pages which I will place in the private content area – when I view the product page – only half of the page loads. When this happens, the search site feature doesn’t work.