Hi there, I can fix your site that is developed using Magento 2. Using LAMP, Angular JS, Elastic search. I have faced these type of issues many time I know how hard is to find & to remove this error. The situation where system run out of memory is due to code bugs, Its like batch request error dear. I can resolve this for you. I am senior Magento Developer with skills of working on other technologies as well. Please come to chat so we can discuss this & will take step to reslove this asap. Regards, farhan