Photos not loading and/or showing error messages

I am having issues with photos not loading on my site. This includes both featured images on the home page, as well as photos within posts.
I am running the Foodie Pro Theme and checked with the theme administrator. They think this is a database issue and suggested I check with you all.
A majority of my photos are jpegs, 680 x 400-500, and 70-100 KB. With the exception of the featured images, those are larger files, some up to 5 MB. If I load the smaller file size as a featured image, the slider images on our home page become distorted.
Sometimes photos load and sometimes they don’t. I am running on a high speed wired connection and have tried this in multiple browsers and on multiple devices. There is no consistency with all photos loading every time. Instead of a photo, the site will show an icon with the photo name, or a blue box with a ?.
I am hosted by Bluehost, and I am running a few plug-ins. These include EasyRecipe Plus, Yoast SEO, Jetpack, Genesis responsive slider, JQuery Pin it button, and W3 Total Cache.
Our site is https://www.ourfoodfix.com/ and here is an example of a specific post where I have been seeing photo error messages. https://www.ourfoodfix.com/sweet-tangy-bbq-pork-sandwiches/
Thanks in advance for any insight!