it is due to corruption of system file.
Now you need to flash your System Software and Update it manually. said:
Download latest Full OTA Update from oneplus official website
move downloaded file to root directory, now go-to
settings>>system>>system update>>gear sign at right upper corner>>local upgrade>> select downloaded file
now wait system will update your software.
Do a System Reset.
I have not had any legs or slow problems with my new OnePlus 8t I really like it
Is it a lag or is it an UI error message?
Maybe scroll the forums for the error message and read the tips there. A few topics already opened.
Try to clear cache and reset wifi. Then try the other suggestions
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by Sarah P., 2021-04-13