A recent disturbing discovery. I had 3 HTML modules with extensive content post on a page. All was working well.

I just recently wanted to add an existing module to the page. After I clicked on the selected module to add my page froze.
In the past I was able to just recycle the page and try again. But now on 2 separate occasions after recycling the page the old content disappeared. 

We checked the database and in the Module table the Module IDs we missing and all associated content. I guess a question is what should have been done instead of refreshing the page.