My garmin 630 did that one day. It did a 5 second countdown and did a reset. Erased my steps, wrong date and wrong time. I had to turn it off and back on and then go outside and act like I was going for a run. It corrected after acquiring GPS signal. Sadly, not long after that I started noticing poor battery life. I eventually upgraded to a Polar Vantage M.

Yeah, I seem to remember reading on the Garmin troubleshooting page that you just need it to acquire a GPS signal to reset the time (like starting a run and waiting for it to get GPS). That happened to me before with my 735 and I'm pretty sure that solved the problem!

Makes sense to me. I will try this in the morning when I go for a run.

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Not a coach. Not a FOP Tri/swimmer/biker/runner. Barely a MOP AGer.
But I'm learning and making progress.

My unit is two years old now. Still working, but battery life is diminishing although I still managed a full 70.3 with it earlier this year.

GPS is good and bad - sometimes takes a few seconds, sometimes 10 minutes and other times I can't wait around and it only kicks in half way through my run.

Rest time is hit and miss too - I might record a 10-min walk and it tells me rest time is 8 hours. Or 48 hours after a 5km run.

I've had 2 good years with it, no complaints. Just wish it would last longer without the niggles.

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My race site: https://racesandplaces.wixsite.com/racesandplaces

I remember mine doing the same a while back and I got frustrated that I couldn't fix it, then it seemed fix itself. As mentioned above assume this was due to getting a GPS signal.

One problem I have had is that it pauses by itself. My last one I only had for a short time as sometimes it would continuously pause. Got a new one at it has been fine for the 9 months or so I've had it till now and it has started pausing itself every now and then. Not very often, but I'm sure it will only get worse. The store I bought it from, said they no longer do returns in-store, because they have had a lot of issues with Garmin products and now returns can only be done directly through Garmin.

Do you have a custom watch face installed? My wife had the same problem and we traced it back to the widget she installed to show cats playing when her watch was in standby (time) mode, even if it was in a sport mode at the time.

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"...the street finds its own uses for things"

Thanks for all the input. After the two replies on GPS, I did go out last night for a minute to try to get the GPS signal. It looked like it found a good signal, but the time didn't change. This morning when I woke up the time was correct, but the date still showed 6/22/20 (Ground Hog Day).

I do have a downloaded clock face, so maybe that also affects it.

What's funny is yesterday morning my wife asked me what I wanted for my birthday (in a couple of weeks - the big 60). I showed her a Fenix 6 - then about an hour later was when the time went bad. She is teasing me about making it go bad so I could get the new watch.

Heading out on my run (pacing my wife for a 5k PR) so we'll see what happens.

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Not a coach. Not a FOP Tri/swimmer/biker/runner. Barely a MOP AGer.
But I'm learning and making progress.

Throw in some random crazy pacings.
Blame it on the watch.
Slam dunk for the Fenix in a fortnight 😁

My 735XT would occasionally do this. It was not my daily wear, and I used to turn it off between uses. However, when I just left it on all the time, it never had an in issue with time since.

Yeah, my 735xt is a bit finicky too. Sometimes after charging I have to turn it off and then back on again to get the time to reappear, then I have to acquire a GPS signal to get the correct time. That's annoying but not a deal breaker. I do wish however the swim GPS was more accurate. I do a lot of OWS and unless I know my exact meters of the course I'm swimming it's hard to get a feel for whether my pace is improving.

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"They know f_ck-all over at Slowtwitch"
- Lionel Sanders

Or, even better, lower her PR by 18 seconds.

She was very happy, especially considering it was 80f and 100% humidity. She knows in "good" (cooler/low humidity) she would have even done better.

Once the watch got the GPS signal locked on the time/date is now correct.

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Not a coach. Not a FOP Tri/swimmer/biker/runner. Barely a MOP AGer.
But I'm learning and making progress.