For me, the Visonic sensors were scattered throughout my house. They mostly paired OK from the window or door I had them on. In fact, the closest one gave me the most trouble. Other ST branded sensors were pretty far away and worked OK when paired with HASS.
Paired on SmartThings (where they are now because of issues), I have had zero reliability issues for the last month or so.
Its very possible there are interference issues that I can’t avoid the way my setup is although it was never an issue before. I have everything in my hall closet’s top shelf. Cable modem, router, switch, NAS, Rpi with HASS and Z wave stick, SmartThings hub, Ooma hub, and a UPS.
For what its worth, I had a period of months while migrating to HASS where there were two Z wave networks coexisting side by side (ST and HASS). No issues with either in terms of reliability. I understand they are different frequencies than Zigbee, wifi, etc. Just stating an observance. I am finally Z wave free on ST and have the radio disabled. I only use ST for Zigbee at the moment.
Those are my random thoughts. Hopefully useful.