My family member has a Galaxy Core Prime. Whenever she gets a inbound call from someone in her contact list, it only shows the phone number. Sometimes after 3-4 rings it will show the name, but not always. I tried a few things to try to fix it, the best temporary fix so far is clearing the cache data, which fixes the problem for the next inbound call. However, the next call afterwards reverts to the same problem.
I checked to see if there are any software updates, but everything seems to be up to date. The newest version of android for this phone is 5.1.1.