Unable to save in Storyline 360

On a fairly routine basis I receive the attached error.  Once this error occurs I have no other option but close Storyline without saving, so any recent work is lost. Trust me, I save often now. I would attach a story file, but it doesn't seem to matter, as it has happened on several different files, some very large, some as small as four slides.  

If I reopen Storyline, it opens fine and I can access the file again, minus any recent changes. 

I can usually tell the error is going to occur because I notice that text boxes no longer display on the slide, but I can still see them in the timeline. 

I wasn't sure if this was a memory/hardware issue or if it was software related, I was hoping for a second opinion. 

Thanks,

Tim