It looks like I'm facing the same problem. After the phone is restarted the clock works perfectly for some time. But it freezes at some point. I'm talking about both clocks - the widget one and the one in the top of screen. Sometimes both clocks show different times (both not accurate). The real problem is that today my alarm didn't start and I woke up too late - because the clock didn't work. My phone (M5) is quite new (about a month), I didn't install so many apps (maybe 10).
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