Fatal error: Allowed memory size of 805306368 bytes exhausted (tried to allocate

Part 1
I called my my hosting company (Site Ground), and they mentioned on their end everything looks good and to check with you. There are times that I login to make changes to my site and I get this message .
(Fatal error: Allowed memory size of 805306368 bytes exhausted (tried to allocate 184320 bytes) in /home/customer/www/brianh19.sg-host.com/public_html/wp-includes/class-wpdb.php on line 2425)

And then another message that tells me to login into my admin.
I have tried that and the email address associate with my account and I get this message.
(There has been a critical error on this website. Please check your site admin email inbox for instructions.)
I login and get a message that says email is not valid or something like this.

Part 2
When I login to wordpress to work on my site I am able to do that.
However the past month or so, when I try to make simple changes or to add a video, when I click on update I get this message.

Server Error (500 Internal Server Error)

I am only having issues on the home page, if I make any changes on any of the other pages it works just fine.

Please and Thank you
Brian

• This topic was modified 1 year ago by livinlife000.

The page I need help with: [log in to see the link]