Fatal error: Out of memory | Is it a theme's error or need hosting service fix?

Once I installed the theme I started receiving these fatal error messages like this:

Fatal error: Out of memory (allocated 82575360) (tried to allocate 196608 bytes) in /home2/gerardoreyna/public_html/wp-content/plugins/redux-framework/ReduxCore/inc/fields/typography/field_typography.php on line 430

Other similar errors appears if I hit F5 in order to refresh the page, like this:

Fatal error: Out of memory (allocated 82575360) (tried to allocate 24320 bytes) in /home2/gerardoreyna/public_html/wp-content/plugins/redux-framework/ReduxCore/inc/fields/background/field_background.php on line 288

I have tried editing the wp-config.php file in order to add two lines of code as follows:

define( 'WP_MEMORY_LIMIT', '1024M' );
define('WP_MAX_MEMORY_LIMIT', '1024M');

These lines were installed right before the /* That’s all, stop editing! Happy blogging. */

The errors appear randomly when navigating inside the wp-admin panel, the errors started just after installing all the required plugins. Once I tried activating them, the process stopped and Visual Composer was not activated. So I clicked the “Activate” link for Visual Composer. After which the errors started.

I am in a HostGator Baby (Shared) Service (https://www.hostgator.com/web-hosting)

uname -a
Linux gator4153.hostgator.com 3.10.0-693.17.1.2.ELK.el6.x86_64 #1 SMP Thu Feb 8 23:35:45 MST 2018 x86_64 x86_64 x86_64 GNU/Linux

Wordpress 5.03 installed.
Basic Plugins preinstalled and activated when WordPress was installed.
EZP Coming Soon Page Versión 1.0.7 | Por Snap Creek Software | https://es.wordpress.org/plugins/easy-pie-coming-soon/ is the only additional plugin installed.

Anything I can do on my end before going to HostGator’s support?

Please let me know if you need further information.

Thanks in advance.