Our build server contains lots of modules, and is frequently under high load (we're adding slaves to distribute the load over different servers).
The problem is that sometimes, under high load the builds fail when trying to parse the cobertura files.
These are the details of the error:

[DEBUG] --------------------
[INFO] Cobertura Report generation was successful.
[TASKS] Skipping maven reporter: there is already a result available.
[JENKINS] Recording coverage results
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Internal error in the plugin manager executing goal 'org.codehaus.mojo:cobertura-maven-plugin:2.4:cobertura': Cannot parse coverage results
Premature end of file.
[INFO] ------------------------------------------------------------------------
[DEBUG] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Internal error in the plugin manager executing goal 'org.codehaus.mojo:cobertura-maven-plugin:2.4:cobertura': Cannot parse coverage results
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:698)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
at org.apache.maven.lifecycle.LifecycleExecutorInterceptor.execute(LifecycleExecutorInterceptor.java:65)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at hudson.maven.agent.Main.launch(Main.java:185)
at hudson.maven.MavenBuilder.call(MavenBuilder.java:160)
at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:1064)
at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:995)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:287)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
Caused by: org.apache.maven.plugin.PluginManagerException: Cannot parse coverage results
at hudson.maven.agent.PluginManagerInterceptor.executeMojo(PluginManagerInterceptor.java:196)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
... 28 more
Caused by: hudson.util.IOException2: Cannot parse coverage results
at hudson.plugins.cobertura.CoberturaCoverageParser.parse(CoberturaCoverageParser.java:89)
at hudson.plugins.cobertura.CoberturaCoverageParser.parse(CoberturaCoverageParser.java:52)
at hudson.plugins.cobertura.MavenCoberturaPublisher$MavenCoberturaActionAdder.call(MavenCoberturaPublisher.java:281)
at hudson.plugins.cobertura.MavenCoberturaPublisher$MavenCoberturaActionAdder.call(MavenCoberturaPublisher.java:267)
at hudson.maven.MavenBuild$ProxyImpl.execute(MavenBuild.java:415)
at hudson.maven.MavenBuild$ProxyImpl2.execute(MavenBuild.java:488)
at sun.reflect.GeneratedMethodAccessor511.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at hudson.model.Executor$1.call(Executor.java:514)
at hudson.util.InterceptingProxy$1.invoke(InterceptingProxy.java:23)
at $Proxy65.execute(Unknown Source)
at sun.reflect.GeneratedMethodAccessor876.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:274)
at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:255)
at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:215)
... 9 more
Caused by: org.xml.sax.SAXParseException: Premature end of file.
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:395)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:198)
at hudson.plugins.cobertura.CoberturaCoverageParser.parse(CoberturaCoverageParser.java:81)
... 26 more

Any help would be appreciated.
Let me know if you need more information, I'll be glad to give it !

Thanks a lot,
Frederic