Zwave roller shutter device offline

Tags: #<Tag:0x00007fc203318ae0>

Hi,
I have 6 zwave rollershutter device.
If I use a associations group function or I create a group in the .item and .sitemaps file, when I use a single command for all the rollershutter there are a delay (no problems) but some of the zwave rollershutter device go to offline and the roller shutter stop, for use this device I must switch off and switch on again the zwave device (it doesn’t even work through the physical buttons).
What is the problem?
The polling time or other?
I’m new of the zwave world.
Thanks.

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