Not sure if its the same problem as I have or not, but if I have VoLTE turned on, this happens, but when off, my contacts are named as normal when they call. So far I haven't been able to fix the problem.
Unfortunately turning off VoLTE means your phone has to drop back to 3G to make and receive calls. Not good that you have a phone that uses the latest technology and it has to be turned off. Will be serious when 3G is closed down
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