I might try something easy like "rebooting" the switch first to see if that helps (pull the air gap for a few seconds of more, then push it back in). Moving the hub nearer could be something you try temporarily, and if that helps, ensuring you have a repeater in range may be a good long-term solution. Might not be that easy of a fix, but probably worth trying at least the former first.
Otherwise, it looks like you might be stuck having to re-pair it. To do that, you'll first have to factory reset the switch or do an exclusion. If you opt for that, it may be easier to do the exclusion with another hub or controller, since doing it from this hub will also delete the device and can affect apps (including Rules) that use the device (though if you don't have any or can re-do everything on your own after, either way is fine).
Instead of the re-pair, you can also try a Replace. You'll still have to make sure the switch is factory reset or excluded (and this time, you definitely can't use the same hub), and you'll need the "Replace" button to show in Z-Wave Details (might already be there, or if you refresh once or twice after the reset or whatnot, that may be enough). I've had much better luck with the regular inclusion process, but this should theoretically work, and it won't disrupt any apps on the Hubitat side since it will treat it like the same device. So, if it works, it may be easier in the end