Leviton 3-way zwave switch going offline

Almost a year, I’ve had a Leviton 3-way switch to control my front porch lights. Iffy at first, then seemed to work well. For the past week, it shows “offline” most of the time, but sometimes, goes back online, then “offline” again. Same happened at the same time with the garage door and one CREE bulb in the house. Right now it’s “offline” and I cannot control it at all. Any thoughts? Thanks!