Xiaomi India — Software fault in POCO F1 phone

Sir,
Is this why we purchase your flagship phone or we spend some 21000 Bucks on your to get this type of fault each and every time. Since june in my poco f1 phine one security patch update use to show and when dowload gets complete each and time a pop up comes up that not enough memory in cache partition please reboot and every time i reeboot it says same thing... Any how i went to service centre and after installing update manually data of my phone get reset.. and again i have to install everything from starting and now when MIUI 12 update comes it says same thing sir i tell you one thing this phone was my dream phine at a time... It makes me very dissappointing when I have to face such thing. I have attached a screen shot of that.