LG Watch Urbane™ 2nd Edition LTE - Restart / Soft Reset

Note A forced shutdown / soft reset can resolve issues like continuous resetting/rebooting, device crashing, freezing, won't ring or vibrate, can't make or receive calls, device locks up and screen doesn't respond.

Note With a hardware reset, you can force your LG G Watch to shut down in situations where the screen hangs/freezes or won't restart normally without erasing saved settings or personal data.

To restart your LG Urbane Watch, hold the Power button in until the screen goes dark and then let go. The watch will shut down and reboot.
Hardware reset button