Since restoring from my old iPhone 5S backup onto my 6 Plus 128GB (AT&T) running iOS 8.0, my 6 Plus is laggy (animations are very slow and stutter), freezy (after hitting "done" it often freezes for a good five seconds before registering the click), buggy (the keyboard sometimes doesn't appear at all, the "halos" around the folders on the home screen sometimes appear and sometimes don't, seems totally arbitrary), and crashy (whenever doing certain tasks like fast app switching, trying to change wallpaper, and others, the phone crashes, turns off the radios, then shows the Apple screen before rebooting). The crashing is happening once every five to ten minutes, making the phone VERY FRUSTRATING TO USE.
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i'm getting a similar issue as well. My 6plus is now consistently crashing showing "red screen." I would often times get "blue screen," but now it's mostly just red screens. My phone keep rebooting and then reaches the red screen, and reboots again.