If the blinking front light on your Camon 11 is stuck on constant lighting and does not turn off even when you switch off the phone, it could be a hardware problem. There may be an issue with the phone's circuitry or with the LED light itself. You could try a few things before taking the phone to a repair shop. First, try removing the battery and SIM card and leaving the phone off for a few minutes. Then, reinsert the battery and SIM card and turn the phone back on. If the issue persists, try performing a factory reset of the phone to see if that helps. If the problem still persists after trying these steps, it may be best to take the phone to a repair shop to get it checked by a professional.