Hi Eileenpatricia,
I think I've found the cause of the issue!
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When typing into the text area of the forum (or other text area), if your cursor is moved and focused (by clicking) outside of the text area, the backspace key now behaves as a back button, taking you back to the previous webpage, resulting in the post being lost.
The cause:
This issue is specific to the browser Internet Explorer not browser specific, and is due to a default keyboard shortcut, that causes the backspace key to behave as a back button when the cursor is no longer 'focused' or active within a text area.
It affects other web forms and browser-based applications like Outlook too, will also cause you to 'view the folder one level up' if not in a browser. This is true both on Windows and Mac computers.
Many people have reported the issue on answers.microsoft.com, here.
The solution:
In Internet Explorer, it appears that there is no way to override this default shortcut. My first suggestion would be to simply use another browser, such as Google Chrome, which has an extension that can be added to disable the shortcut, or Mozilla Firefox, which has a built-in way to do the same. Information on how to do this in Firefox and Chrome can be found here. Note that these extensions and settings can affect the stability of your computer and are used at your own risk. If you must continue to use Internet Explorer, be sure that when editing your posts, that the cursor is active (flashing) within the text area before you hit the backspace key!
Another way to help prevent accidentally deleting your longer posts is to first type it in another application such as Word or Notepad, where you can save it, and then copy and paste it when creating a new post.
I hope this helps to resolve the issue. Please continue to post details here if you have other issues with losing posts that may have a different cause.