I have not made any changes to the site and all of a sudden this started happening:

Fatal error: Out of memory (allocated 15466496) (tried to allocate 53248 bytes) in /home/sourceg/concrete5.6.2.1/concrete/core/libraries/block_view.php on line 314

and

Warning: Creating default object from empty value in /home/sourceg/public_html/controllers/by-product.php on line 29

Warning: Cannot modify header information - headers already sent by (output started at /home/sourceg/public_html/controllers/by-product.php:29) in /home/sourceg/concrete5.6.2.1/concrete/core/libraries/view.php on line 957

I've contacted our server and they insist that it's nothing on their end but a couple weeks back our site went down and I think that something might have happened during that time to cause these new issues.