'Unfortunately Contacts has Stopped'

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http://forums.androidcentral.com – I just changed mobile phone from Iphone5 to LG G3 and transferring all contacts to this device. Firstly, it was working fine but when I tried to edit contact it showed "Unfortunately, Contacts has Stopped" I did factory reset , it worked correctly for 2 hours and then started to show the same thing again. LG support asked me to reset and change the way to transfer contacts from icloud. I did it few times but it came out the same thing after awhile. I tried to put new contacts manually avoiding question of transferring contacts from IOS, now this time I can edit with that new cont (HowTos)