Iphone reconnection issue

I set up zerotier on my iphone and it worked perfectly for over 24 hours - until I left my house. When I got back home I noticed that it had stopped working. In the iphone settings it shows VPN connecting but it never reconnects and zerotier central shows it to be offline. I’ve tried rebooting, manually changing the VPN toggle in both the zerotier app and the ios settings - all without success. I haven’t tried deleting the network and re-adding it as that is not a viable solution everytime I move between cellular and wifi. Anyone have any ideas on how to correct?