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Hi, welcome!My Coolpad legacy did the same thing 1 week after I brought it. Had to do a hard reset. To get contacts working again. Did it again last week. Just found an easier way then a hard reset. Go into system settings, hit apps, then hit show system apps. I cleared all caches and data from everything in there that said contacts or contacts storage. Turned off the phone, enabled them again and everything started working right again. Figured it out yesterday and lost no previous contact info.