DNS AAAA error

Hi,

Our DNS server cosntantly shows this kind of error.

03-Jun-2014 13:35:16.328 DNS format error from 192.168.0.1#53 resolving n4g4.akamai.net/AAAA: non-improving referral

03-Jun-2014 13:35:16.328 error (FORMERR) resolving 'n4g4.akamai.net/AAAA/IN': 192.168.0.1#53

Does anubody know what it can be?