Messages app - keyboard not popping up on a few message threads

I've been having an issue in the last week or so with the keyboard not showing up on some message threads. I can't find any link between them except that it seems to be only green text message threads, I haven't seen it happen on an iMessage thread yet. It's only on a couple of them though, not all. I have tried everything I can think of short of a full wipe and reset which I would like to avoid. Deleting the thread and starting a new one with the same person made the keyboard show back up for that person, but then it started happening on a different thread. I also don't necessarily want to keep deleting threads since I would lose all the conversation history. Any ideas?