Thank you. After looking at the thread you suggested, I do not think enabling mobile support is an appropriate solution for my issue. Specifically, in the thread where enabling mobile support fixed their issue, the issue was an occasional Astra layout shift on mobile screens for cached pages. This is different from my issue, where on occasion a cached page is created that has no formatting throughout the page on both desktop and mobile. I understand that Astra is a responsive theme, needing only one cached version to cover both desktop and mobile, and that enabling mobile support is not appropriate for a responsive theme (see here). Do you or anyone else have any other ideas please?