Garmin 680 nuvi screen unresponsive worked fine then not. no temp or hit prob

Hi,

I will suggest you reset your GPS, to reset your gps, follow this steps, turn off your device. Press down on bottom right corner of the touchscreen, and then power on the GPS unit. You should be prompted whether do you really want to erase all user data, or asked if do you really want to start up in maintenance mode. Press Yes to reset (warning: all data will be erased and lost, so backup before proceeding) or enter maintenance mode.
Once the GPS unit is reset, remember to place the device outside where there is a clear unobstructed view of the sky for 15 to 30 minutes in order for it to requires fix to GPS satellites. with this, the problem should be rectify.