It would be great if you can do what grif091 describes. If it turns out the PLM section is locking up – we can do an occasional test. If a software reset works, we can look at doing a recover on lockup of the PLM.
If the sw restart does not work, there are one or two other ideas I have if you would be willing to work with us on some test frames.
Thanks for your time – and sorry for the lack of fix (so far).