Yes, especially if you have a weak mesh and many devices are routing through that switch and have no other route to the hub.
Suggestions:
(1) read How to Build a Solid Z-Wave Mesh - Hubitat Documentation
(2) get some good repeaters. I suggest (and use) the Ring Alarm Extender Gen 2, which has a Z-Wave 700 series chip and internal battery backup, and can give power fail alerts
(3) install Tony Fleisher’s (@tony.fleisher’s) excellent user-contributed Hubitat Z-Wave Mesh Details app. It will show you where the issues are.
(4) and, as noted above, get rid of any “ghost nodes” (devices on Z-Wave details page with no in, out clusters) that result from failed pairings. They mess up your mesh. Search the forum for how to remove.
