Woak up this moring to find my GXP2170 (9.121) frozen. None of the keys responded. I had not made any changes to either the network, UCM or phone (and the phone is provisioned via Zero Config with few exceptions - and they had not changed).
I rebooted the phone and the worked, but none of the SIP accounts registered.
After trying to reboot as second time, I updated the firmware to 9.127.
All is working.
Just sharing, but wondering what the heck happened…