avrdude: verification error, first mismatch at byte 0x0172 0x52 != 0x25

Arduino nano, IDE: Arduino 1.8.5

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The error when uploading is this: avrdude: verification error, first mismatch at byte 0x0172 * 0x52 != 0x25* avrdude: verification error; content mismatch avrdude: verification error; content mismatch

Later i got another error: avrdude: verification error, first mismatch at byte 0x0042 0x06 != 0xdb avrdude: verification error; content mismatch avrdude: verification error; content mismatch

Help please