Vizia RZS05 switch turning itself on??

This just started happening a week ago. I’m not sure if it’s my Vera Lite turning it on or there is something wrong with the switch. Has anyone had any similar experiences?

This is a binary (on/off) switch that has been working fine for 4 years. Nothing has changed on the Zwave network recently. I have power cycled Vera, but it still occurs. I can’t see any consistency as to when it occurs. Sometimes every few hours, sometimes not for a day or two.