Magento 2 Intermittent Cache Issue – Showing a JSON code Instead of Homepage

We have a multi store running with Magento 2 and sometimes when we try to load the homepage it shows the JSON below instead of the home page, it only works again if we clean cache.

Strange enough is that if we try to navigate in any other page of the website it works just fine, it is just the homepage.

Any idea what may cause that?

{"categoryProducts":"","navigation":"","navigationTop":"","breadcrumbs":"","h1":"","title":"HIDDENSITE.com","categoryData":"

","bottomCmsBlock":"","url":"https://www.HIDDENSITE.com/","productsCount":"0","js_init":"","isDisplayModePage":"","currentCategoryId":"0","currency":"","store":"

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n","store_switcher":"","behaviour":"","cmsPageData":""}