Z-Wave network reliability

Please note that the thread is from January 2022 when there was no Homey Pro 2023 yet. So the posts all refer to the Homey Pro (early 2019 or earlier).
But since you mentioned LAN, you seem to own an HP23, right?
The Homey Pro 2023 uses different hardware and it is still in beta. Please have a look at the HP23 firmware changelog (Link).
What firmware do you have installed on the HP23?
And could you please post a screenshot of the Z-Wave overview? (Developer Tools → Z-Wave)

Edit (start)
Do you use the “new” power supply with 5.2 V?
Did you tried already a PTP?
Edit (end)

They are repeater.

It doesn’t matter which manufacturer the Z-Wave devices are from, they just have to be compatible with HP23. But they must be connected to the main power supply.

Pls see the second link.