Custom functions disappearing from script file

Hi,

I am have seen a few instances recently of my database (v2.2.9) dropping
custom functions from the script file.
I take nightly backups and am seeing that on one night all the functions
will be there and then the next night (and from then on) they are missing.
All other data seems to remain intact.

Specifically, a typical function in the script file looks something like
this:

CREATE FUNCTION PUBLIC.FORMATCUSTOMERNAME(IN FIRSTNAME VARCHAR(40),IN
LASTNAME VARCHAR(40)) RETURNS VARCHAR(80) SPECIFIC FORMATCUSTOMERNAME_10066
LANGUAGE JAVA DETERMINISTIC NO SQL CALLED ON NULL INPUT EXTERNAL NAME
'CLASSPATH:xxx.formatCustomerName'

Do you have any idea what could cause these functions to be dropped from
the database?
I believe something similar may also be happening to the global temporary
tables from time to time.

Thanks for your help,
Dean

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