I have a love hate relationship with OnX. The app has worked great at times, other times it has failed miserably. Like others have mentioned, I use it as my primary GPS but also have a backup plan in place always. I am not sure I am going to renew my subscription next year.
As mentioned, once everything is set and downloaded, I keep it from trying to connect to cell service. It does seem to get funky when that happens. I was in Wyoming last week hunting elk and my "high res" 5mile maps were all downloaded. I checked them before I left and all was good. Out in the field, they all became "low res" maps. Not a massive deal but still the crap that bugs me because it never seems to just work flawlessly. Problem is there arent many alternatives out there. I do still like looking at a paper map though so may just go back that way