Weird MCH3401 error when using QUSRJOBI API

Okay. This one has me baffled. I have a file that records the user's job information while they are working with the records in the file, i.e. I selected 10 records and they are currently "locked" so other users don't get the same records as I do.

As a "just in case" measure, prior to a new selection, I check these "locked" records to ensure the job is still active. If the job is dead, the record status is changed. This routine will happen a lot through the course of the program.

My problem is that the program I call to verify the status will run fine the first time it's called, but will fail with the MCH3401 message on subsequent calls.

The program is currently prototyped in the caller.

dGetJobStat pr EXTPGM('SYS01010')
d 26A const
d 1S 0

and then called:

callp GetJobStat($jobnameql:$jobactv);

Message ID . . . . . . : MCH3401 Severity . . . . . . . : 40
Message type . . . . . : Diagnostic
Date sent . . . . . . : 09/22/08 Time sent . . . . . . : 12:17:08

Message . . . . : Cannot resolve to object Þzir.
Type and Subtype X'0201' Authority X'0000'.
Cause . . . . . : Either a system pointer or a data pointer can not be
resolved.

The weird part is the object name returned in the message. The text changes each time, but this time it came back as ' Þz ir '

This is the line that produces the error in SYS01010:

C Call 'QUSRJOBI'
C Parm QusI020000
C Parm ReceiveLen
C Parm FormatName
C Parm JobName
C Parm IntJobName
C Parm QusEc

How can I resolve this? Do I have to declare the API as a pointer and call it by address? Any advice will help.

Thanks,
Tom Armbruster