@cooldog1 you’re not alone with your ZEN16 relay issue. I also have similar problems, but it is not quite as bad now that I’m on hub firmware 48.2.
What firmware is your Zen16 on?
One unit I have was constantly going offline, has not gone offline since 48.2, but I still have the issue with the 3 relays not activating, but the main does.
I also had a Aeotec plug that was going offline, the one thing they all had in common they were all onboarded under the prior hub firmware. It is also stable now.
I’m in contact with @TheSmartestHouse support, I suggest you do the same if you purchased it from them, as it maybe a device firmware issue.