Was in CCA ( 2.1) > Configuration > Voice > User Extensions.
Made a change to my extension for testing Button labels.
When I clicked 'Apply' In addtiion to rebooting my phone, other phones throughout the company rebooted. Luckily none that were in use rebooted.
I have only Administrative access to UC right now and haven't made any other changes since last save all yesterday.
Any ideas why this occured?