Keynote will not quit and not autosaving
I've been using Keynote for years will no issues, but recently I find that I can be working on a presentation but when I go to quit the program nothing happens. I need to restart the computer and reopen Keynote. Often I've lost a lot of work so it doesn't seem to be autosaving frequently. I'm using an older MacBook Pro (2010) and El Cap, also installed all updates. Any suggestions greatly appreciated.
MacBook Pro (17-inch Mid 2010), OS X El Capitan (10.11.1)