I'm having this issue. But IMO, considering I just flashed stock and updated to OTA, maybe all my suggestions and personal dictionary got erased. I think this keyboard learns words and suggestions as you type. So I'll just wait some more days to see if it gets a hangs on my conversations and typing.
I thought that too at first but I notice its putting duplicate words in sometimes too. The word I just typed will be followed, without a space, by the same word, or partial same word. Very strange and incredibly annoying if you are typing anything more than a word or two. May have to look at other options. This is my 3rd day on the update and the keyboard has not gotten any better