We are also having problems with templates. We have found that copy and paste from one source to the template is not saving. That said we have found that taking smaller amounts of copy and pasting and saving is more successful.
Either way there is an issue here, specifically around copy paste, then save.
Were you copy-pasting an image in your content? In our instance we found that this was the problem, and removing the image from the content allowed the template to save. Instructions for the best way to add an image to a template are at this link: https://confluence.atlassian.com/conf57/creating-a-template-701434853.html#CreatingaTemplate-Imagesandotherattachments
It was an image causing the save to fail. We found this out by trial and error, copying smaller sections and saving each time. Really annoying that it cleared all the content rather than showing a broken link for the image.
Maybe this is something the team can resolve.
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