This sliding door activates a switch inside allowing the camera to come on. This could be you issue right there. I would have it looked it and replaced if needed at a camera shop.

What happens over time is this switch inside wears out and does need to be replaced.

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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620