I am new to Disney so I have only been using any of their technology for about 8 months. However, I have definitely noticed that the phone app is much less reliable than MDE online. Most of the time the app says I have to call to cancel a reservation or even make a new one. Then I login through the website and it goes through no problem. I also have issues where my changes don’t refresh for days even after I manually hit the refresh button. It’s almost useless to me at this point. I always use the browser on my phone or tablet. I was hoping to use the app for maps and food ordering when we are there next week. We will see.