It is an interesting issue. We were on the Grand in October. Internet wasn't as good as pre covid but very ok. Medallion worked ok. In December we were on Enchanted and I have no issues with anything. All worked fine. In April were were on the Ruby and If it worked on my app, it didn't on my wife's and vice versa. So finding each other was not an option unless you restarted. And the timeline would only spin in a circle. Internet was only able to download words like in an email. Couldn't load a picture unless you waited several minutes. They did tell us and it would usually help: close the app and re-sign in. It would then do the one thing before it was hit or miss. We did have an unexpected dining time change as the app suddenly changed our time by 30 minutes. The Medallion itself worked fine. Finicky app or not, I was just thrilled to be cruising again!