[Koha] Zebra Index stopping daily

Hey Everyone, There has been a strange issue with my install over the past 12 months or so. The Zebra index seems to stop daily. A crontab has been setup to run it daily at 7am -* 7 * * * koha-start-zebra library Despite this, I have to manually restart zebra. Any ideas? I'm currently at the latest version of Koha as I hoped it would resolve this issue. Thanks, Martin Martin House martin.house@gmail.com www.martindhouse.com "An unexamined life is not worth living."