MongoDb Java Driver - MongoException $ Network: Read operation to server localhost: 27017 failed

We started getting the error below with the error last week. Until now, we have not been able to trace this problem in anything in particular. This request is a collection of about 400 thousand objects. We have the same application working for different clients and it started with clients who passed that 400K mark. I ran the request directly and it took about 1.5 seconds. The same exception took place when we repeated the results of another aggregation:

DBCursor cursor = db.cMD.find([colaborador: [$in: listP], data: data], [colab: 1, _id: 0])
def listW = []
while (cursor.hasNext()) //Exception happened here
{ def resultMap = cursor.next().toMap() listW.add(resultMap.colab) }

      

        
        
        
      

    

2015-05-20 14:03:43,511 [quartzScheduler_Worker-6] ERROR listeners.ExceptionPrinterJobListener - Exception occurred in job: Grails Job
org.quartz.JobExecutionException: com.mongodb.MongoException$Network: Read operation to server localhost:27017 failed on database application1 [See nested exception: com.mongodb.MongoException$Network: Read operation to server localhost:27017 failed on database application1]
at grails.plugins.quartz.GrailsJobFactory$GrailsJob.execute(GrailsJobFactory.java:111)
at grails.plugins.quartz.QuartzDisplayJob.execute(QuartzDisplayJob.groovy:27)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
Caused by: com.mongodb.MongoException$Network: Read operation to server localhost:27017 failed on database application1
at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:300)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:271)
at com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:84)
at com.mongodb.DB.command(DB.java:317)
at com.mongodb.DB.command(DB.java:296)
at com.mongodb.DBCollectionImpl.aggregate(DBCollectionImpl.java:99)
at com.mongodb.DBCollection.aggregate(DBCollection.java:1571)
at com.gmongo.internal.Patcher._invoke(Patcher.groovy:49)
at com.gmongo.internal.Patcher$__patchInternal_closure1.doCall(Patcher.groovy:38)
at 
OUR APPLICATION CODE
at GrailsMelodyGrailsPlugin$_closure4_closure16_closure17.doCall(GrailsMelodyGrailsPlugin.groovy:184)
at 
OUR APPLICATION CODE
at grails.plugins.quartz.GrailsJobFactory$GrailsJob.execute(GrailsJobFactory.java:102)
... 3 more
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.read(SocketInputStream.java:152)
at java.net.SocketInputStream.read(SocketInputStream.java:122)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
at org.bson.io.Bits.readFully(Bits.java:48)
at org.bson.io.Bits.readFully(Bits.java:35)
at org.bson.io.Bits.readFully(Bits.java:30)
at com.mongodb.Response.<init>(Response.java:42)
at com.mongodb.DBPort$1.execute(DBPort.java:141)
at com.mongodb.DBPort$1.execute(DBPort.java:135)
at com.mongodb.DBPort.doOperation(DBPort.java:164)
at com.mongodb.DBPort.call(DBPort.java:135)
at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:292)
... 16 more

      

        
        
        
      

    

Any ideas?