I recently upgraded my 635 to W10M to test it out before I buy the Lumia 950. Since I have updated, I have found that many of the apps I used to use crash fairly often. I expected this on new W10 universal apps like the new FB and MS Messaging, etc, but I have found that it happens on some WP8.1 apps as well. The most egregious of these is the FB Messenger app! It crashes most of the time within 20 seconds of opening it. Once it starts it won't stop unless I reboot the phone. Even then it will only open correctly a few more times. Does anyone else experience this?? Does anyone who has a L950/XL notice this? It is kinda a deal breaker as Messenger is one of my most frequently used apps.