Also check the keyed locking tab to see if it has been bent down any. If it has? The locking handle could be fully depressed and still, fail to lock, because the locking tab would/could go under the locking slot in the handle.
FJR - 2014 ABS California Model
Indian Chieftain - 2016
Spyder RT S - 2011
Identify what you have control over and find peace with what you don't.
Iíve never lost a case in nearly 16 years and over 120k miles of FJR ownership (now on a 2013 model) but last year for the first time I discovered the reason it could happen, and itís exactly consistent with the video showing above. The cases cannot detach in normal circumstances, but over time I found that the metal tab that connects to the lock and holds down the handle had worked loose. This meant it wasnít holding down the handle in a locked position, meaning it could come loose. Itís a simple fix requiring just a couple of grub screws (if theyíve completely gone) and some loctite.
Itís the only way short of a a severe impact that the cases can come away.