Pages disappearing-links randomly being changed

Had site for a few years. When I went to edit a page, it showed nothing there. It came up on the live site but editor showed it as a blank page. Then the live site no longer showed contents. I had to redo it all. Then another page did the same thing, and another. I’m having to totally rebuild my entire site because pages keep disappearing. Now customers are telling me that links to a product they had just used, suddenly are taking them to another area of the site (I’ve not redone those pages or edited them in a year). It seems as soon as one page is recreated from scratch, another fails. And now links are not taking people where they should go. My site is slowly crumbling and I’m losing customers/orders WHAT IS GOING ON, this is my business site!

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