I'm not playing with it every moment of every day so of course I could be missing some outages through good luck
About how often do you typically use HondaLink, daily, more than once day, a few times per week? I normally use HondaLink at least twice a day, setting a timer schedule at night, checking charge status in the morning, and some days using remote climate. Like you HondaLink is pretty much rock solid for me, in the two and a half years that I have been using it the only times that I have had a problem were periods of one to two days where it would not connect, and in each case people started coming onto forums like this indicating they also were having a problem. And then typically it started working again for everyone at the same time.
This time it's a little different because the problem seems to be occurring for several hours at a time, every few days, at least that is my experience, which is why I think maybe people are seeing posts like this and by the time they try it it is working again. However I have not heard anyone yet say that the problem comes and goes for them, so I don't rule out that my situation is unique. For me it stopped working again today, sometime between 6:58 am EDT when it last updated, and 10:30 am which is when I made my first stop today, which the car should have reported charge status at that time, but it didn't. It is still not working for me as of 7:00 pm EDT. Was anyone able to successfully use HondaLink today between 10:30 am and 7:00 pm EDT?
So FWIW, I know from experience HondaLink can work really well and be super-reliable. It just depends on location.
That may be true as a general overview of HondaLink but at the moment I do not think it applies to this situation. For me the problem occurs whether I am at home or relatively far from home. I live in a highly populated metropolitan area of a large city, so as I drive around I will be within range of several several different AT&T towers at least according to the cell tower maps that I have seen online (AT&T website only shows coverage area, not cell tower locations). Once the problem starts I don't get connection in any location, for up to a day at a time.
Today as an example, my HondaLink app was successfully refreshed at 6:58 am this morning at home when it reached 100% and charging stopped. However - nearly twelve hours later the app is still stuck at Last Updated 06:58 AM even though I have done 61 miles of driving today. My farthest location today was 22 miles away, with three more stops in between, for a total of five stops. The car would have normally reported each of those stops to the Honda server, but it didn't. Nothing has been reported since 6:58 AM this morning. Again I am pretty sure that in my area I was in range of more than one AT&T tower.