Hi friends, When I upgraded my Koha server (Testing Server) from Koha 17.05 to 17.11, I found everything OK. After 2 days, when I searched books, CD/DVD, etc., I found no records in Koha catalog. I checked "About Koha" page and found that Zebra server stops automatically. Then I started Zebra Server in the command line interface and then I get all records in the Koha Catalog. Again after 3 days when I searched record in the Koha Catalog, I found no records. Then I started Zebra server again. Why this things happens? Do you have any permanent solution?. Please suggest me. Sambhunath Sahoo Information Scientist, Central Library, Tezpur University, Tezpur-784028 Assam Mobile: 9085252152, 8895488636 Phone : 03712-27-3229 E-Mail : sambhumlis@gmail.com, sambhu@tezu.ernet.in