(sorry to all caps but we're not going to make progress on this issue with commenters adding insufficient information)
We'd like to be able to fix this, but we really need more information to do so. Please, whenever you encounter the error in the description of the ticket, zip the build folder ($JENKINS_HOME/jobs/$PATH_TO_JOB/builds/$BUILD_NUMBER/) of the build that failed and upload it here, redacting any sensitive content as necessary, and include any relevant information on frequency of the issue, steps to reproduce (did it happen after Jenkins was restarted normally, or did Jenkins crash), any exceptions or warnings in the Jenkins system logs that seem relevant, etc. Thanks!
Ramon Leon **Sorry, I don't think we can get that information from ci.jenkins.io - the infra team is overloaded and we need the zip of the build folder immediately (or very soon) after the error.