Contact names not showing

I have Samsung Galaxy S6. There was an android 7.0 version update recently on my phone. Since the update I can't see contact names in my default messaging app and in my calls history.
I can only see contact number when I receive texts or phone calls.
To fix it I have so far tried few options.
1. Cleared contact, messages cache then restart phone, didn't work.
2. Clear phone cache then re boot, didn't work.
3. Changed one of the contact number to start with country code, it worked.
My question is, is there any other way to fix this issue rather than changing all the contacts to start with country code? I have 430 contacts in my phone book.
Thank you in advance.

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