I've noticed some random RF issues with my RFX250 systems.

1) Try moving it. I've noticed it can become very sensitive to being close to some electronics - sometimes for seemingly no reason.
2) Try unplugging power specifically to the antenna. Often this resets the issue, for whatever reason.
3) Try another day. Stupid as it sounds, I seem to have some days where it's just glitchy as hell, and then the next day all is fine again.

Otherwise, it could have failed.