Sense 2 hasn't synced lately

[LOIj]

Usually my phone app and Sense2 have recently synced.  If it is way off, I restart the phone and it is fine.  It was synced this morning.  This afternoon I was wearing the watch, but reading on my phone for awhile. When I checked the app, it said they hadn't synced for 19 hours.  Restarting the phone got them to sync. 

But now I see that the info under "today" was all blank.  I changed the choices, but what now shows up wasn't what I chose.

I've had this smart watch 2 months.  The only thing it is good at is making me feel that I'm smarter than it is.  

Any suggestions?  How can it not sync when the phone and watch are only 6" apart?  How can the app occasionally show more steps than the watch?

Moderator edit: updated subject for clarity

[DavidFitbit]

Hi @LOIj, thanks for stopping by, I hope you're doing well.

Let me help you with the syncing issues you a re experiencing with your Sense 2 and your Fitbit app. Thank you for all the troubleshooting you have already tried.

If the app doesn't sync automatically, attempt to sync manually by following the instructions in our help article How do Fitbit devices sync their data? > How do I manually sync my tracker or watch?

In addition, there are a few steps that we recommend for this kind of issues in our help article Why won't my Fitbit device sync? They are listed chronologically, so check them and see if they are useful to resolve your issue.

[LOIj]

Thanks for the answer.  Yes, I was able to sync.  But my question is deeper than simple syncing.  The directions always say that the watch and phone should be nearby each other.  What exactly does that mean?  If my watch in on my left wrist and the phone is in my left hand for quite awhile, why would they not sync automatically?  Why would the two be synced at 9 a.m. but 6 hours later, why would they say that they hadn't synced in 19 hours?  There are so many things that one can see on the phone and also on the watch, such as notifications, so why would you need them on the watch if you have to have the phone nearby to make the system work properly?  I feel like I am missing the point of all the things that the watch can do.