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This is usually an issue with the Firmware, so I would first like you to do this please.
Hold the power button to off for 60 seconds.
Release, then try to turn on the unit and use it.
Let me know the results please
ok, it is either the battery or mainboard that has faulted, being 3 years, it is very common that the battery is the issue and needs replacement
The battery you can get here
I have a film on replacing the battery for the forerunner which is the same procedure for you
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.