Did you restore the SQL packages along with the rest of system after the disk failures? If so, I would recommend to delete the SQL packages as described in SAP Note 63037. There may be a bad pointer in an SQL package, and that can have unpredictable results, such as unexpected SQL errors.
If that does not help, you should check the developer trace and the joblog for further information, such as the message(s) preceeding the SQL0129 error code. You may have to report the problem to IBM then (hoping that you are running a supported level of IBM i).
Kind regards,
Christian Bartels.