I've never even heard about this issues and I hang around Apple-related forums and websites quite a bit. However, I and many others have a ridiculously long laundry list of iOS 8 bugs that haven't even been addressed. How about all the crashing?
My 6 Plus many times can't even switch from one Safari tab to the next without the last one reloading when you go back. I don't even remember my original iPhone with 128MB of RAM being that bad.
Furthermore there are tons of other glitches, like white text overlaying the black status bar text sometimes, rotating video glitches on the Plus, problems with reachability not activating (sometimes it just stops for several minutes and then works fine), or reachability not even working with quick reply which means I can't reach the send button, or the Touch ID dialog screen sometimes freezes up the phone with a dark overlay that makes it impossible to touch anything, or iCloud Photo Library that has never worked, or the shoddy WiFi issues on the Air 2, or problems with slow-mo videos sometimes not recording in slow-mo, or that my share sheets sometimes still lose the order I've set the icons to, and several other things that I can't even recall at the moment.
My iPhone 5 on iOS 7 was much better (software-wise) than my iPhone 6 Plus on iOS 8. Otherwise the 6 Plus has a gorgeous display, amazing camera, and looks really great.