Used to Be Great - Now Slow & Buggy w/ Tasks Disappearing – Microsoft To Do Review

What happened? It seems once I updated to the latest iOS the app got extremely slow to the point I need to force quit multiple times during usage. It's also slow to sync with my desktop version. With the latest update, tasks are mysteriously disappearing on the app but seem to be available later or on the desktop version. Please fix these problems, you "had" a great app!
Review by Former Nextel User on Microsoft To Do.