Not recently. I was able to the track progression of the corruption using our nightly backups. The records became corrupt over a two day period (Friday and Saturday). On Saturday the file was only accessed by our "Sentinel" box so that leads me to suspect it. This box is set up to automatically import data every morning around 5:45 AM & runs 24/7. It has not had a problem in weeks so I don't think it is crashing out, but the imports are kinda big so that might be munching the data.
As for the conversion question... Yes, it has been converted over the years starting with FMP 4 or 5. I've never seen problems like this in any of our DB's hosted by FMS 4, 5 & 7. We did upgrade this year to FMP 9 Server Advanced, but can't directly tie this issue to the upgrade.
Thanks,
Darrin