Causing All other Apps using iCloud Crash – GV Mobile + for Google Voice Review

I'm not certainly what's going on and I use GV Mobile+ very well for a long time. I like this very much so I installed it on all of my devices, iPhone, iPad and mini. Then recently I found it causes all other apps using iCloud crash and syncing issue, like Notability, Documents5, Clips, iA Writer and so on. After I remove this app then iCloud is working very well.
Review by TsuTW on GV Mobile + for Google Voice.