Freeze during use / standby and reboot [Oppo F1f]

hi, it happened to someone who f1 crash occurs during use and then reboot? also the night, for example, I see that sometimes the screen turns on, the device connects to the 4G signal and reads microSD as just restarted! I will try the same with a hardreset, I wanted to get some feedback from you.

note: I never formatted the device in the 4 times when update was released

thank you