Дженкинсу иногда не удается клонировать / получить

Я регулярно запускаю код, размещенный на Gitlab, в Jenkins. Время от времени плагин Jenkins GIT не может получить удаленный репозиторий. Он отлично работает, когда я просто запускаю его снова.

Есть идеи? У меня есть уведомления о неудачных сборках, и это сводит меня с ума.

Вывод:

Started by timer
[EnvInject] - Loading node environment variables.
Building remotely on vps6 (worker) in workspace /home/worker/workspace/foo
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url git@gitlab.com:bar/foo.git # timeout=10
Fetching upstream changes from git@gitlab.com:bar/foo.git
 > git --version # timeout=10
using GIT_SSH to set credentials 
 > git fetch --tags --progress git@gitlab.com:bar/foo.git +refs/heads/*:refs/remotes/origin/*
ERROR: Error fetching remote repo 'origin'
hudson.plugins.git.GitException: Failed to fetch from git@gitlab.com:bar/foo.git
    at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:888)
    at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1155)
    at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1186)
    at hudson.scm.SCM.checkout(SCM.java:504)
    at hudson.model.AbstractProject.checkout(AbstractProject.java:1208)
    at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:574)
    at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
    at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)
    at hudson.model.Run.execute(Run.java:1727)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
    at hudson.model.ResourceController.execute(ResourceController.java:97)
    at hudson.model.Executor.run(Executor.java:429)
Caused by: hudson.plugins.git.GitException: Command "git fetch --tags --progress git@gitlab.com:bar/foo.git +refs/heads/*:refs/remotes/origin/*" returned status code 128:
stdout: 
stderr: ssh_exchange_identification: Connection closed by remote host
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2002)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1721)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$300(CliGitAPIImpl.java:72)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:405)
    at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:153)
    at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:146)
    at hudson.remoting.UserRequest.perform(UserRequest.java:210)
    at hudson.remoting.UserRequest.perform(UserRequest.java:53)
    at hudson.remoting.Request$2.run(Request.java:364)
    at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
    Suppressed: hudson.remoting.Channel$CallSiteStackTrace: Remote call to vps6
        at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1737)
        at hudson.remoting.UserResponse.retrieve(UserRequest.java:313)
        at hudson.remoting.Channel.call(Channel.java:952)
        at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:146)
        at sun.reflect.GeneratedMethodAccessor109.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:132)
        at com.sun.proxy.$Proxy52.execute(Unknown Source)
        at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:886)
        at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1155)
        at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1186)
        at hudson.scm.SCM.checkout(SCM.java:504)
        at hudson.model.AbstractProject.checkout(AbstractProject.java:1208)
        at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:574)
        at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
        at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)
        at hudson.model.Run.execute(Run.java:1727)
        at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
        at hudson.model.ResourceController.execute(ResourceController.java:97)
        at hudson.model.Executor.run(Executor.java:429)
ERROR: Error fetching remote repo 'origin'
Finished: FAILURE