It isn't, but here is a little fix(sometimes it happens again and you need to restart your phone)
http://forum.xda-developers.com/mot...enmod-12-1-t3066007/post60127168#post60127168
If you want Android 5.1 without that bug you can try the AOSP ROM, but it doesn't have root
http://forum.xda-developers.com/moto-e/orig-development/rom-android-source-project-t3086015
But is aosp for dual sim device
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