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Button push leads to Black Screen of Death

So the watch is less than 18 months old. It's been doing weird things lately and today it's finally hit the wall. It went flat with 50% battery or so at lunch time so I charged it in my car. Went to swim tonight and turned it on. As soon as I tried to navigate to start the swim and pushed the down arrow it went to a black screen and turned off. The same happened with the up key when I turned it back on. Is it worth going to the effort of doing a full reset?

Garmin Forerunner 735XT