508 Insufficient Resource The website is temporarily unable to service your request as it exceeded resouce limit. Please try again later. in laravel

I have an error that is confusing me a lot and I need help.

Js code work in page loaded.

Check_carts();

and api called by Ajax;

It takes a long time to get a response and it doesn't show anything,

after long time, The page loads slowly and may give error 508 or 503 or get memorylimit or it may not load at all.

thanks.