The second i've heard mentioned before.
The first is new to me. Before the obvious suggestion of a factory reset, you might try to do a very long power-press, (about 10 sec) it seems to do a deeper reboot than just the ordinary 'restart'.
Strange. I tested the usual fixes (restart phone, clear data, clear cache, reinstall Swiftkey...).
I tried one more time removing and reinstalling Swiftkey and now it started working again.
Two years later....BUMP! I guess this didn't happen, but if @Hyrum is still around, there are a lot of people who now own these things, and X variants heading out soon. Show of hands....who's still interested?