Lately, my app says "Can't connect right now". "right now" can be described as months. So, the big button has been getting used a lot. The only thing about not using the app, is that was the only way I could be sure it got to the rooms I thought it did. The roomba is basically an idiot that just finds its way literally by bouncing off of things. There are times I've seen it clean the same area multiple times while never going to a different room at all in the same cleaning cycle. So by viewing the map, I can know if I need to pick it up and lock it in the room it missed.
The fact that it needs an internet connection for that is maddening.