That has name resolution written all over it. If you ping by IP, there is no name resolution. If you ping by name, the name is resolved to an IP through DNS.
If this is the only DC, and it points to itself for DNS, then it likely isn't registering in DNS. The netlogon service starts before the dns service. Try this:
net stop netlogon
net start netlogon
ipfonfig /registerdns
nbtstat -RR
This should get all the entries for the DC registered properly. Try pinging again and see if you notice an improvement.
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