@telrod11
Can you try "peeking" at the next message (swiping a little)? To see if it's there?
My theory is that the app isn't keeping up with loading the next message -- so when you delete, it has no message to go to.
If that's the case, you should also not be able to "peek swipe" there.
Now, five seconds is a really long time... Are your messages often unusually large? Say, hundreds of kilobytes? Does the app's UI performance seem sluggish in general? If so, can you try Menu -> Compact the database in the app's main window?