Woocomerce causing error 503.

Hi all. Excuse me in advance I’m still fairly new to the coding side of things.

I have recently upgraded a number of plugins and wordpress itself. I started having problems on the site connected to error 503. It was not possible to log in from the front or back end. I then disabled woocomerce from within hostinger and managed to get back into the site.

Obvs I nee to run woocerce so I then upgraded the website PHP version from hostinger to 8.0 and continued to get the error. I spoke to hostinger and they told me to go back to 7.4.

I can now get back into the front and back end however when I try and edit a product it lets me get in the product for the first time. I exit and go back to it and get either:

‘There has been a critical error on this website. Please check your site admin email inbox for instructions.’ or ‘error 503.

I added WP debug to hostinger wp-config document however I’m getting an error on query monitor: Use of undefined constant ‘WP_DEBUG’ – assumed ‘‘WP_DEBUG’’ (this will throw an Error in a future version of PHP). If I purge all I can get back into a product only for one time.

This is the error type I’m getting from wordpress automated ‘your site experiencing issues’ email.

An error of type E_ERROR was caused in line 2012 of the file /home/u434113947/domains/odd-beats.com/public_html/wp-content/plugins/woocommerce/includes/wc-core-functions.php. Error message: Allowed memory size of 2147483648 bytes exhausted (tried to allocate 75928297480 bytes).

Could you anyone please guide me to how I can fix this?

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