I've had my vivofit 4 for 2 months and now the button stop working. Because it stopped working, I can not do a hard reset to see if it was a software's issue. So I decided to open it up to discharge the battery and put them back again so the tracker will reset. After opening I found out that there was water inside the device, that's probably why the button malfunctioned. The problem is I never go swimming, the device never left my wrist as I only go running, take shower, washing hands...
My old vivofit 3 which I used for more than 2 years only left my wrist twice for battery replacement and it worked find until the day I gave it to my nephew. So the question is what is the real water resistance level of vivofit 4 ? Honestly I'm so disappointed because an upgraded item should be better than the old one (vivofit 3).