As Cameron mentioned a large form could be causing this behavior.
What's bad is that when a user logs out it will tend to re-open the same form they were on and if you have a form which has a lot of cells it can wreak havoc.
Check out the Planning Service in task manager and see if it's using a lot of memory and/or CPU when this is happening.
Also if you have users seeing the freeze you can look at the memory consumption of their web browser for really large forms you will see IE/Firefox use up to 500MB of ram on the client side.
On the planning server also review the memory settings for Planning and bump them up if they are defaults. I've also seen people suggest changing the stack space to 4mb for really large forms -- you may want to be a little more conservative and use 2m for your -Xss and 1024m for your -Xmx settings.
The Xss and Xmx settings are under the key:
HKEY_LOCAL_MACHINE\SOFTWARE\Hyperion Solutions\HyperionPlanning\HyS9PlanningI
Regards,
John
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