Z-wave issue in a metal-framed house

Hi all

I have a metal framed house (something like this: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRIcoLW-LQ9KA_t4G1by_G0vOOsupzP7nZmCw&usqp=CAU)

I noticed a couple of aeotec z-wave devices (smart plug gen 6, smart plug gen 2, multi sensor gen 5) don't seem to work nicely, either slow connections and not responsive.

Does anyone else experience the same thing?

ZigBee seems to be okay (Samsung smartthings, hue motion sensor, hue smart plug), although ZigBee devices not as good as zwave, battery status not very accurate, and before you know it, it has a flat battery already.