Devices disconnect after long inactivity

I have about 15 things connected to my smart things hub v2, most of which are light switches. Others are, garage contact sensors, outlet switches, and Philip hue bridge.

One thing I noticed was that a few of my devices (light switches) sudden became “unavailable” on the classic app. These devices where mainly the ones that I haven’t turned on for a long time. Perhaps months. I tried to turn them on via the app, but nothing works. I logged into the smart things api configuration homepage and the log shows online. What I did noticed was, when I physically go turn on the switches, after a minute or 2, it becomes available again and I can control it via the app and with Google mini.

Is devices going dormant normal for smart things after long inactivity?

What are the brand and model of the light switches?

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1 is GE. the other was VISION Z-WAVE IN-WALL 2-RELAY DOUBLE SWITCH ZL 7432US.