Timed out reading query result from queue when running purge unused snapshots task

2017-05-10 15:20:52,086+0200 INFO [quartz-1-thread-6] *SYSTEM org.sonatype.nexus.repository.maven.internal.PurgeUnusedSnapshotsFacetImpl - Purging unused snapshots 600 days or older from repository orbis-snapshots
2017-05-10 15:21:17,399+0200 INFO [pool-21-thread-9] anonymous com.sonatype.nexus.plugins.outreach.internal.outreach.SonatypeOutreach - Outreach bundle unavailable http://orbis-maven.agfahealthcare.com/nexus3/oss/3.3.1-01/en/anonymous (404:Not Found)
2017-05-10 15:21:52,101+0200 ERROR [quartz-1-thread-6] *SYSTEM org.sonatype.nexus.repository.maven.tasks.PurgeMavenUnusedSnapshotsTask - Failed to run task 'Purge unused Maven snapshot versions from orbis-snapshots' on repository 'orbis-snapshots'
java.lang.IllegalStateException: Timed out reading query result from queue 181ac967 after 60 seconds
at org.sonatype.nexus.repository.storage.OrientAsyncHelper$QueueConsumingIterable.hasNext(OrientAsyncHelper.java:201) [na:na]
at com.google.common.collect.TransformedIterator.hasNext(TransformedIterator.java:42) [com.google.guava:21.0.0]
at org.sonatype.nexus.repository.maven.internal.PurgeUnusedSnapshotsFacetImpl.deleteUnusedSnapshotComponents(PurgeUnusedSnapshotsFacetImpl.java:164) [na:na]
at org.sonatype.nexus.transaction.TransactionalWrapper.proceedWithTransaction(TransactionalWrapper.java:56) [org.sonatype.nexus.transaction:3.3.1.01]
at org.sonatype.nexus.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:54) [org.sonatype.nexus.transaction:3.3.1.01]
at org.sonatype.nexus.repository.maven.internal.PurgeUnusedSnapshotsFacetImpl.purgeSnapshotsFromRepository(PurgeUnusedSnapshotsFacetImpl.java:145) [na:na]
at org.sonatype.nexus.repository.maven.internal.PurgeUnusedSnapshotsFacetImpl.processAsHosted(PurgeUnusedSnapshotsFacetImpl.java:120) [na:na]
at org.sonatype.nexus.repository.maven.internal.PurgeUnusedSnapshotsFacetImpl.purgeUnusedSnapshots(PurgeUnusedSnapshotsFacetImpl.java:109) [na:na]
at org.sonatype.nexus.common.stateguard.MethodInvocationAction.run(MethodInvocationAction.java:39) [org.sonatype.nexus.common:3.3.1.01]
at org.sonatype.nexus.common.stateguard.StateGuard$GuardImpl.run(StateGuard.java:270) [org.sonatype.nexus.common:3.3.1.01]
at org.sonatype.nexus.common.stateguard.GuardedInterceptor.invoke(GuardedInterceptor.java:53) [org.sonatype.nexus.common:3.3.1.01]
at org.sonatype.nexus.repository.maven.tasks.PurgeMavenUnusedSnapshotsTask.execute(PurgeMavenUnusedSnapshotsTask.java:59) [na:na]
at org.sonatype.nexus.repository.RepositoryTaskSupport.execute(RepositoryTaskSupport.java:56) [na:na]
at org.sonatype.nexus.scheduling.TaskSupport.call(TaskSupport.java:89) [org.sonatype.nexus.scheduling:3.3.1.01]
at org.sonatype.nexus.quartz.internal.task.QuartzTaskJob.doExecute(QuartzTaskJob.java:145) [org.sonatype.nexus.quartz:3.3.1.01]
at org.sonatype.nexus.quartz.internal.task.QuartzTaskJob.execute(QuartzTaskJob.java:106) [org.sonatype.nexus.quartz:3.3.1.01]
at org.quartz.core.JobRunShell.run(JobRunShell.java:202) [org.quartz-scheduler.quartz:2.2.2]
at org.sonatype.nexus.thread.internal.MDCAwareRunnable.run(MDCAwareRunnable.java:40) [org.sonatype.nexus.thread:3.3.1.01]
at org.apache.shiro.subject.support.SubjectRunnable.doRun(SubjectRunnable.java:120) [org.apache.shiro.core:1.3.2]
at org.apache.shiro.subject.support.SubjectRunnable.run(SubjectRunnable.java:108) [org.apache.shiro.core:1.3.2]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_131]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_131]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
2017-05-10 15:21:52,103+0200 WARN [quartz-1-thread-6] *SYSTEM org.sonatype.nexus.