we have specup up our mongodb instances  each shard conisists of 3 instances primary, secondaray & arbiter at that time in primary instance have executed the command  rs.stepdown()  and after steeping down i have received this error in all instances. what causes this error 

Log File Monitoring : key = error, File = /var/log/mongodb/mongod.log (host01:log[/var/log/mongodb/mongod.log,@mongodb_error,UTF-8]): 2018-09-20T02:38:14.332+0900 I REPL     [replication-1] Restarting oplog query due to error: InterruptedDueToReplStateChange: operation was interrupted. Last fetched optime (with hash): { ts: Timestamp 1537378260000|1, t: 45 }[1353989873524125418]. Restarts remaining: 3