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There may be several reasons why your case may
be transferred from Service Center to local office.
Fingerprinting issues is one reason, random selection
is another. Although, if the service center adjudicator
feels that you need to be interviewed to check some
paperwork, that may also trigger a local transfer.
I think Houston has one of the worst processing times,
if your application falls into the family based immigration queue,
something like 1078 days.