Not the entire UConnect, but the performance pages part of the UConnect always seemed to load up slow and then they quit working altogether coupe of weeks ago. So I stopped the car, let it sit for 5 or 10 minutes and then started it again but that didn't work. I then read somewhere to just let it sit 24 hours or overnight. (I thought to myself, wtf good is that going to do?) Guess what, it worked and I haven't seen the problem again. Not sure if that will help with your problem but you might what to give it a try.
If that doesn't work you may want to watch the utube video below on how to reset the entire uconnect system using the "hidden" factory" menus. But it warns you to be careful.