I've searched the web and stackoverflow and have not seen any mention of this issue. Specifically, when I am editing a text file (insert mode), at some point during the editing session, textwidth stops working and my lines no longer wrap. In every instance, I am entering text at the end of the line when textwidth stops working. The only way to restore textwidth functionality is to close and reopen the file.
Has anyone else experienced this? If so, is there a fix?