Onstat question

When we use the Onstat -u , sometimes we get this display: onstat -u INFORMIX-OnLine Version 7.12.UC1 -- On-Line -- Up 11 days 20:31:52 -- 142096 Kbytes Userthreads address flags sessid user tty wait tout locks nreads nwrites 332c020 ---P--D 0 informix - 0 0 0 2100 1585 332c6a8 ---P--F 0 informix - 0 0 0 0 0 332cd30 ---P--F 0 informix - 0 0 0 0 0 332d3b8 ---P--F 0 informix - 0 0 0 0 0 332da40 ---P--F 0 informix - 0 0 0 0 0 332e0c8 ---P--B 8 informix - 0 0 0 1868 10682 332e750 ---P--D 0 informix - 0 0 0 0 0 3330170 Y--P--- 11899 G4SLUS03 - 5fae4e0 0 1 44 109 3330e80 Y--P--- 11837 intdba ttyq1 603cef8 0 1 1 0 3331b90 Y--P--- 11812 sylvainL ttypc 4437548 0 1 2 0 Changing data structure forced command termination. Does anyone know why we are getting the message "Changing data structure ..." ? How can we prevent this from happening ? We found that, by bringing Online down and then up, it solves this problem. Is there a better alternative ? Thank you Michel