Not sure if you get crash logs but I am on an iPhone 6+ running iOS 8.3 and I just had news blur freeze then crash to a blue screen (wtf?!) then the phone rebooted. Anyway if you get the crash log it might be interesting to check out.
Thanks for letting me know. Rebooting the phone sounds like it might be fixed in iOS 8.3.1, since it’s probably a UIKit or low level framework bug. If I find anything that crashes the app, I’ll get it fixed, but in my usage of the app on 8.3 for the past few days, it hasn’t crashed.