Z-wave interference when too close together

I have a “closet” at about 8 meters away from Homey where my central heating system, floor heating pump and warm water system is placed. In this closet I have 3 NEO Coolcam power nodes and a Fibaro FGS-222 relay.

Between Homey and this closet I have about 4 z-wave powered devices (Fibaro and Aeotec).

Z-wave in my home is stable, but not for the nodes in the mentioned closet.

Could this be because nodes are too close together? The NEO plugs are all placed in 1 four way mains socket. Is this a problem?

Do you have a suggestion?

I guess not. Why?

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