STM8S003 program disappears

I am currently using STM8S003 and use to option byte

During normal use, sometimes the program suddenly disappears.

Then when re-burn, it will fail and the following message will show:

Errors while setting configuration with MCU name STM8S103F3P: gdi-error [40701]: Option bytes read error

I don't know if it is a problem with the MCU itself or with my circuit?

(Vcc = 3V / with internal oscillator)

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