I am encountering issue with Magento stability. Version 2.2.5. It is only a month old installation. When I login to Admin Panel, I can navigate to any screen/page/configuration. However, if I make any configuration changes and save, or even click on 'flush cache management', the admin panel screen closes and then I can not access Admin Panel because I get 404 page not found error. Additionally my website loses all its images, and the web content formatting changes.
I keep a copy of Magento folder, that I use to overwrite the exisitng Magento folder to recover from the above crashes.