Vivofit 4 losing time.
Every time when backlight is switched on, time on the watch is freezing for about 1,5 seconds. So if i'll switch on backlight 4 times, the watches will 5 seconds behind. If i'll switch on backlight 10 times, the watches will 15 seconds behind. And so on. Problem is the backlight turns on every time when i try to use functions. It happens many times during the day. And if you don't use the synchronization the watch starts show wrong time pretty soon.