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This is not an isolated problem.
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Also, wait 3-6 months after a new model comes out and let suckers like me sort out the problems
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There were two nearly fatal problems that caused me to contact Garmin and start the process of returning it:- it crashed, repeatedly, always in the middle of runs;- the Bluetooth signal is so weak, if my arm is at my sides below the waist, the headphones cut out
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It’s a good watch that had some very bad problems that were partly fixed with a couple of firmware updates
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I've been wearing the Garmin Forerunner 645M for about a week now and love it