Good you got it fixed!
I was following this thread because of being curious for the cause of your problem.
@francisp was spot on! 
A zigbee network can work really well but it’s important to set it up the right way.
To be honest, I started with zigbee without much knowledge and you learn as you go, sometimes the hard way when a lot of your smart devices don’t work anymore.
I don’t know if you have seen this but it’s advisable to read for anyone new to zigbee:
Guide for Zigbee interference avoidance and network range/coverage optimization
Maybe it’s not bad to add that link to your OP or the solution so this thread becomes even more interesting for anybody with a similar problem.