Thanks for the reply.
We have single publisher to single subscriber replication.
I checked and found that the disributor agent job is scheduled to run once in every 15 mins and we have only one distrinutor agent job.
I found this issue last week.
But it is running fine.
Any ideas for the issue to occur occasionally.
By the way I have one more query.
Is there any way to find the no rows that is being transferred from publisher to subscriber.
Is this information is logged in any table of the distribution database.