You “fix” it by taking the battery out and putting it back in. 😜
Seriously, it does sound like a bug in your camera, but it could be caused by a faulty battery or resolved by changing settings related to how long the screen stays on after taking a shot. Or could it be that your camera starts sending the screen output to a connected device (a phone or tablet, via wifi?)
What you describe, going off after taking two shots, and requiring removing and re-inserting the battery (not just turning on and off the power), sounds like a real issue, not just a default being reset by removing and re-inserting the battery. So there are a few possible fixes:
- You “fix” the problem by returning the camera to Canon (for in-warranty repairs).
- You “fix” the problem by installing a firmware update in your camera (possible fix, but I’m not sure)
- You experiment and see if any changes to possibly relevant settings fix the issue or change it (e.g. the display settings and/or pairing with a smartphone)
- You just shoot and ignore that screen on the back of your camera.