I too am facing the same error..

Msg 0, Level 11, State 0, Line 0

A severe error occurred on the current command. The results, if any, should be discarded.

This is occurring while running the below script.

update <tab_name> set code = 'CANCELLED' where nbr = 'A325'

Unable to figure out whether this is due to dependency to this table or some other issue. The server timeout value is set as: 10 mins which is quite good.

Any suggestion would be highly helpful.