Caching issues in Enfold

Hi, my host, Dreamhost, has alerted me that Server-Side caching is not working as it should, and they indicated that it is being caused by Enfold.
This was their message:

You might want to reach out to the theme developer about this because as you can see from the results it is keeping the server from caching. No caching means every page has to load, and thus cause performance issues as you been seeing.
!hat can be done to make their theme more user friendly with server-side caching?
The theme uses PHP sessions which interfere with the server-side cache.
The built-in caching is not working.

+———————-+———+————————————————-+
| name | status | message |
+———————-+———+————————————————-+
| Cache Service | Warning | Nginx caching service is running but is unable |
| | | to cache your site. |
| Remote IP | Awesome | Your Nginx Proxy is set up correctly. |
| Age Headers | Awesome | Your site is returning proper “Age” headers. |
| Cookies Found | Warning | Cookies have been detected. Unless your caching |
| | | service is configured properly for the specifi |
| | | c cookies, it may not cache properly. Please co |
| | | ntact your webhost or administrator with inform |
| | | ation about the cookies found. |
| Cookie: PHP Sessions | Bad | A plugin or theme is setting a PHP session cook |
| | | ie on every pageload, which prevents caching. |
| Plugin: Wordfence | Warning | This plugin uses cookies, which may prevent ser |
| | | ver side caching. (Active) |
| Theme: Enfold | Warning | The Enfold theme uses sessions for every call o |
| | | f shortcodes in certain situations. (Active) |
+———————-+———+————————————————-+