May I ask what pi browser is?
I saw you have LSCache, CloudFlare + super cache enabled at the same time. Not pretty sure which caused the issue. If it happens every day, could you help to narrow down the issue and share the result with us?
its a browser you can download from google play and applestore on mobile.. right now i got this 404 not found error you'll see if you visit the website from computer browser and all browser is affected. All i did was I logged in to webadmin and edit listener and checked all binding Process 1, Process 2, Process 3, Process 4 and enabled/change secure to yes.