Cloud flare display my website as blank page suddenly after months of no problem



i had sudden problem from couple of hour my very busy website shows blank page in chrome and sometimes other browsers without single change from my side i cleared cloud flare cache it worked for while then do same problem
so i restored even website backup through the hosting technicals and still had same problem
when i disabled the cdn and make cloud flare as proxy only website is working .
do anyone face same problem?? , i think there are a problem in cache system in cloud flare
security agency scanned my website and backups nothing there
so if anyone face same problem inform me please