ESQL/C Online 4 Error -242 Isam -101 help please

I just experienced an interesting problem that baffles me: Under Online 4, using ESQL/C, I have prepared an insert statement for a table. Everything works fine for ~10K transactions (this insert is only a small part of the entire transaction). Suddenly, the insert starts failing with: -242 Cannot open database table table-name -101 ISAM error: file is not open There was another process reading the table when the problem first started, but it went away and the problem continued. The table is on the same machine as my insert process, and was created with LOCK MODE PAGE. My process has SET LOCK MODE TO WAIT 60, but the error is returned immediately, so it does not look like a timeout. Can anyone give me some direction in debugging this problem? Thanks in advance, Andrew Shaw AT&T Bell Labs shaw@mink.att.com