My Canon digital camera, the camera can't be turned on, the display lens is wrong, and it automatically turns off. What is the reason? Suggest to answer the reasons and solutions!

Let the camera turn off automatically first, and then the lens faces down directly. Then turn it on and turn it off. After about 5 seconds, the prompt E 18 will appear on the LCD screen. Some users browse photos quickly, but E 18 will appear when the lens automatically retracts. When the photography mode is changed occasionally, the E 18 error code pops up in the lower left corner of the LED screen, shouting "Didi", and it crashes at the same time, and it is normal after restarting.