[Koha] Zebra stops every day

Hi All, I am using Koha17.11, I moved my old DB which was working fine in koha16.11, But now my zebra server stops daily or after two or three days, actually i have not noted exact duration. I come to know this error when I see no results in opac search and in About Koha page there is an Error Message saying, "Zebra server seems not to be available, is it started? " Then I issue command, Koha-restart-zebra library And it works fine. But why should i issue the command again and again. Any solutions? Regards, Javed Shoukat