We recently migrated out Forms instance from a Forms Server Authentication model to a LFDS Authentication model. Since the migration users have reported that intermittently they get logged off and directed back to the LFDS login screen. Once they log back in all the information that was captured on the form they where busy with is then empty and they have to re-capture the information. 

We reviewed the post about setting the Time Out setting on the FromsApplicationPool and have increased this to 60 min. The users still have the problem though and are indicating that they could be busy with a Application form on Forms for anything between 5 to 15 min and they are still logged off. The behaviour is not consistent though and seems random. The user could either be selecting Save as Draft or even the Approve / Submit button at the bottom of the form and this then triggers the behaviour. 

Any suggestions on what this could be as this is causing a lot of frustration for the users having to re-capture information when this happens.