Weird .GR DNS problem

This is what I see from

Wed Feb 04, 10:52:06 [513] $ host -t soa gr.
gr has SOA record 902040905 7200 1800 86400 1800

Wed Feb 04, 10:52:13 [514] $ host -t soa gr.
Using domain server:

gr has SOA record 902040704 7200 1800 86400 1800

Could this be the reason that we have a client not visible to the rest of the Internet? Maybe, since the secondaries seem to carry a version of the .GR zone with greater serial number than the master server.

Update: As usual, there are simpler answers: Like the customer forgetting to renew the domain name.

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