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Forerunner 255 Battery Life Accuracy issue

I just had my new forerunner 255 watch. I was testing with the battery life during one of my running when is said 2h left of running battery. After running for 6km about 45mins, the watch prompt me to switch to power saver mode. I choose no option. Immediately the watch turns off by itself! Therefore the estimated battery life on running is not accuracy. Can Garmin update the software on this issue?