2009country, I had the same problem with mine at one time.
When the couch opens to the bed it swivels on two bolts. One on each side.
Once the bed is opened up some arms rest on two other bolts.
On mine, one of the nuts that holds one of those two bolts came off the frame. Those nuts are welded to the frame.
So I got a couple of slightly longer bolts and used jamb nuts to secure it back on the frame.
Take a look at yours to see if one or both of those bolts are loose.
I hope that made sense.
Peace
Dave