Oracle Portal environment comes to halt/crawl

We've got an Oracle Portal environment that will periodically crash (load excessivly slow, almost not loading at all, sometimes pages err out), and we're not entirely sure of the cause. When we experence the issues, the memory seems fine, the processes seems within an acceptable range, etc. We see nothing drastically different from when the system is stable and running smoothly.
If we restart the apps tier and all the WSRP-containers, this seems to have no effect. If we bounce ALL the services, from the apps->sso->oid->db and then bring them back up in reverse order, this seems to resolve the issue, but we still have no way of knowing what was the initial cause.
Anyone have any ideas of something that might be causing this issue, whne all the normal touchpoints seem to be fine?

Hi,
We are looking for similar upgrade? Were you able to make it?
If yes can you tell us the steps followed

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