SAN FRANCISCO — If you are waiting for a DVD from Netflix, you may have to wait a while longer.

The DVD-by-mail service says it has been hit with technical problems, hurting its ability to send out disks.

A Netflix spokesman says it was able to send out some discs yesterday, but none were shipped on Tuesday and it hadn’t shipped any this morning either.

The problems affect all of Netflix’s 55 shipping centers. The company hasn’t specified the problems, nor has it identified the root cause.

About a third of the company’s more than 8 million subscribers are currently waiting for DVDs held up by the problems.