There is a newer hub but it does not support z-wave.
Back to your current hub situation… some questions:
- have you tried a different ethernet cable?
- tried plugging into a different port of switch or router?
- if connected to switch, have you tried a port on the router if available?
- have you rebooted the router?
- have you made any recent changes to your network?
- have powered down the ST hub and removed batteries if using?
- booted up ST hub with no batteries?