It sounds like it is quarterly known that the Explore App update is very buggy. Just adding in my two cents.
66i
Apple iPhone 12 mini
I work in a lot of remote locations. Often no wifi and no cell. I've been using this combination since 2021 or so.
I hope that Garmin can fix these issues as the current ESRI approach is completely unworkable for me because it relies on wifi connectivity. I'm saying this to let you know that I'm rooting for you, Garmin. I've been writing support for your system into my research grants for years and would like to continue doing so. I will also say that the new waypoint icon and color scheme is an improvement as it allows us to mix icon type and color. Very smart. With that said...
App problems that were not issues with previous versions:
1) the icon that shows me where I am hadls disappeared. This happens both when I use the device while paired with my 66i and when I'm using the phone on it's own. It reappears briefly then vanishes again.
2) Along with that, the waypoint icons just randomly disappear, then reappear for a moment after I create a new waypoint, before disappearing again
3) the map resolution is really poor compared to the previous offering, which was already borderline. For example, the satellite map layer is essentially useless at this point. I get it if you want a low resolution option, but there should also be a high resolution option.